Knowing God: What John 17:3 Says About Eternal Life
Short answer: When Jesus prays in John 17:3, he says, "This is eternal life, that they should know you, the only true God, and him whom you sent, Jesus Christ." Eternal life, in that sentence, is not described mainly as a length of time or a location after death. It is described as a knowing, a personal knowledge of God the Father and of his Son. That knowledge is not mere information about God. It is relational, given by revelation, received by faith, and it works itself out in love, obedience, and prayer. Every part of the Christian life grows from this root, and the New Testament consistently treats the knowledge of God as both the beginning of salvation and the shape of it.
Eternal life is defined by relationship, not duration
Most people think of eternal life as simply life that goes on forever. Duration is certainly part of the promise, but Jesus locates the essence of it somewhere else. He is praying to his Father in the upper room, hours before his arrest, and he defines the gift with startling intimacy. John 17:3 says, "This is eternal life, that they should know you, the only true God, and him whom you sent, Jesus Christ." The life is in the knowing. If a person could live a billion years without God, that would not be the eternal life Jesus describes here.
This means that eternal life does not begin when we die. It begins when we come to know God. The believer who knows the Father and the Son already possesses the life of the age to come, even while still walking around in this one. John makes this explicit earlier in his letter, where assurance of salvation is tied to fellowship with the Father and the Son, and the hope of seeing him as he is. Eternal life is not only something stored up for us; it is something given to us now in seed form.
Consider how different this is from religious effort. A person can attend faithfully, give generously, and serve visibly, and still treat God as an idea rather than a person. Knowledge of a subject is not knowledge of a friend. Jesus is not describing a doctrine mastered but a person loved. The words used in the New Testament for knowing God carry this relational weight. To know God is to be in living fellowship with him, to have his life in you, to hear his voice and respond to it.
This also guards us from a cold orthodoxy. It is possible to defend true statements about God while not knowing God. But the reverse error is equally real: a warm spirituality that never submits to the God who has actually revealed himself. Jesus names the true God and himself as the one sent. Biblical knowledge is personal and also defined. It is fellowship with the Father through the Son he sent, and there is no other door into it. Eternal life is knowing them; it is not a general religious feeling.
Who is known: the only true God and the one he sent
Jesus does not leave the object of this knowledge vague. He names two: the only true God, and the one he sent. That phrase, the only true God, sets the knowledge of God within the Bible's constant insistence that Yahweh alone is God. Idols are not alternate deities; they are things we treat as if they had the weight God alone deserves. So knowing God is not generic spirituality. It is knowing the God who has made himself known in Israel's story and now finally in his Son.
Notice that Jesus includes himself without hesitation. Knowing the Father and knowing the Son are placed side by side as the single content of eternal life. To know the one sent is not an optional extension of knowing God; it is the way the one true God is now known. This is the same truth John states elsewhere when he writes that whoever denies the Son does not have the Father. The two are inseparable in this age. The path to the Father runs through the Son.
This matters for the way we talk to people about God. Many assume they can know God on their own terms, through nature, sincerity, or their inner sense of the divine. Creation does speak, and conscience does testify, but the New Testament does not present those as sufficient for saving knowledge. What we need is the revelation of God in Christ. That is why the apostolic preaching is so relentlessly Christ-centered, and why the earliest Christian churches were Jewish people who had come to believe that Jesus was the promised one.
There is comfort here too. If knowing God depended on our own reach, we would never arrive. But because Jesus says the knowledge of God and of himself is eternal life, he is telling us that the way has been opened from the other side. God is knowable because he has come near. The Son who prays these words is the same Son who makes the Father known. He is not hiding behind his own message; he is the message. To know him is to know the only true God.
It is the new covenant promise, not a hidden secret
When Jesus speaks of knowing God, he is not introducing a new idea but fulfilling an old promise. The prophets looked forward to a day when no one would need to say to his neighbor, know the Lord, because all would know him. That promise was tied to the inward work of God's Spirit, writing his law on hearts and forgiving sins. John 17:3 belongs to that stream. The knowledge of God is the heart of the covenant, and Jesus is the covenant in person, the mediator through whom that promise reaches us.
This is why the New Testament can speak of knowledge of God as something given, not merely achieved. It is a gift of revelation. Jesus himself says in this very prayer that he has revealed the Father's name to those given to him. The disciples did not discover God by searching; they were shown him. The same is true of us. Our coming to know God is the fruit of God's initiative, the Spirit opening eyes and hearts to see the glory of Christ in the gospel.
If that is true, then our prayer and effort are not attempts to reach an absent God. They are responses to a God who has come near. We do not climb to him; we receive him. This changes how we read Scripture, how we pray, and how we endure seasons when God seems distant. Even dryness can be held inside the confidence that God has promised to be known and will finish the work he began. His nearness does not depend on our feeling at any given moment.
This is also where community belongs. The new covenant promise is not for isolated individuals. God promises that his people, corporately, will know him. We learn to know him in the teaching and correction of the church, in the prayers and songs and correction of brothers and sisters, and in bearing with one another. Knowing God is personal but not private. The Spirit gives this knowledge to the body as well as to each member, and we are meant to grow into it together.
What this knowledge is not: mere information or mystical fog
Because the word know can be misunderstood in two directions, it is worth being clear. First, this knowledge is not mere information. A person can pass an exam on the doctrine of God and still not know him. Second, it is not a fog of religious feeling without content. Jesus is quite specific: the only true God, and him whom he sent. So the knowledge of God has an object we can name, and it has an effect we should be able to see in our lives. It is neither a fact file nor a mood.
Scripture consistently refuses both errors. The New Testament letters spill over with precise teaching about who God is and what he has done, and they also speak of love, experience, and inner transformation. Doctrine without love becomes cold and even cruel. Experience without doctrine drifts into whatever we happen to prefer. The biblical pattern holds them together: we come to know the true God as he has revealed himself, and that knowledge warms into love, trust, and obedience.
Jeremiah 9:23-24 says, "Yahweh says, ‘Don’t let the wise man glory in his wisdom. Don’t let the mighty man glory in his might. Don’t let the rich man glory in his riches.'" The passage goes on to say that the one who glories should glory in this, that he understands and knows God. What is striking is that this knowledge is not measured by intellectual sharpness, physical strength, or money. It is available to the weak and the poor. The proud cannot buy it or muscle their way into it, but God gives it to those who humble themselves before him.
So examine yourself honestly but gently. Does your knowledge of God move you to pray, to repent, to love the people around you, to want his glory more than your own reputation? Not perfectly, and not all at once. But there should be some evidence. Knowledge of God is not proven by how much religious vocabulary you can use, but by whether Christ is becoming more precious to you and whether his commandments are becoming more dear.
How it shows itself: obedience, longing, and prayer
1 John 2:3-6 says, "This is how we know that we know him: if we keep his commandments." That sentence sounds like a test, and it is. Not because obedience earns our standing, but because it reveals whose we are. The claim to know God while living as though he were irrelevant is empty. John goes on to speak of love being perfected in the one who keeps his word, and of walking as Jesus walked. Knowledge of God is not measured by how warmly we feel on a given day, but by the direction of our lives.
Paul shows the other side of the same coin. Philippians 3:7-11 says, "However, I consider those things that were gain to me as a loss for Christ." Paul had every religious credential a person could want, and he counted them as nothing compared to knowing Christ. His ambition was not to accumulate religious status but to know him, the power of his resurrection, and the fellowship of his sufferings. Here is a man who had seen the risen Lord and still said that his knowing was incomplete, still reaching forward for more.
That combination of assurance and longing is a good model for us. We can know that we know him, and we can still want to know him far better. Growth in the knowledge of God is not a straight line, and it usually costs something. Paul lists losses: things once counted gain now counted as loss. Following Christ reshapes our loves and our priorities. If we come to God only for what he gives, we will drift when the gifts are withheld. If we come for himself, the relationship holds.
And this knowledge is a matter of continued prayer. Colossians 1:9-10 says, "For this cause, we also, since the day we heard this, don’t cease praying and making requests for you, that you may be filled with the knowledge of his will in all spiritual wisdom and understanding." Paul does not assume that knowledge of God is automatic. He prays for it, persistently. If an apostle prayed this way for mature believers, we should pray this way for ourselves and for one another, asking God to fill us with the knowledge of his will.
Mercy and knowledge: what God actually desires
Hosea 6:6 says, "For I desire mercy, and not sacrifice; and the knowledge of God more than burnt offerings." Israel had a busy religious life and a broken covenant life. God was not impressed with ritual performed over a heart that had wandered. The knowledge of God he wanted was not additional ceremony; it was a living relationship that produced mercy toward other people. Doctrine and worship are not replacements for love. They are meant to lead us into it. This is a searching word for anyone who serves God publicly while neglecting him privately.
Jeremiah 9:23-24 makes a similar point with an even sharper contrast. The wise, the mighty, and the rich are told not to boast in what they have. The only true ground of boasting is that a person understands and knows God, who exercises loving kindness, justice, and righteousness in the earth. Knowing God, in this text, is tied to his character. To know him is to know the God who delights in steadfast love and justice, and to be shaped by that same love.
Notice how consistently the Bible connects knowing God with how we treat others. It is not a private experience that leaves our conduct untouched. The person who knows God will increasingly reflect God's own character. That is why Hosea can place mercy alongside knowledge of God and treat them as close companions. The knowledge of God is not measured only by how long we pray, but by whether we show steadfast love to the people in front of us, especially the ones who can do nothing for us in return.
This also keeps us from a spiritual pride that imagines deeper knowledge of God means looking down on others. The more we truly know him, the more we see our own need of mercy and the more freely we extend it. Knowledge of God is not a ladder of status. It is a relationship that humbles us, because the closer we come to his light, the more clearly we see ourselves. The one who knows God best is not the one who talks about it most, but the one who has been most changed by it.
Growing in the knowledge of God today
Where do we begin? With the means God has given. He has revealed himself in Scripture, and the Spirit uses Scripture to make Christ known. So we read, and we keep reading, not to accumulate facts but to meet the living God. He has given us prayer, and in prayer we speak to the one we are coming to know. He has given us the church, where we hear him taught and see his character displayed in the lives of ordinary believers. These ordinary means are the ordinary path to a real knowledge of God.
We should also be honest about the distractions that keep us at arm's length. A constant stream of noise and hurry makes deep knowledge of anyone difficult, and God is no exception. That is not a call to passivity; it is a call to order our lives around him. If we want to know God, we will make room for him. We will put away the things that harden our hearts, and we will come back to him again and again, even when we feel little, trusting that he is faithful to meet those who seek him.
It is worth remembering that knowing God is not something we achieve once and then move past. In this life, our knowledge is real but partial. Paul, writing near the end of his ministry, still spoke of pressing on to know Christ. That is a hopeful picture: the Christian life is a growing acquaintance, not a single transaction. We will spend eternity learning the depths of the God who has loved us. The knowledge that begins now grows forever, and it never runs out.
If you are not sure where you stand, come to Christ as he is offered in the gospel. He is the one sent by the Father, and knowing him is eternal life. You do not need to have everything figured out first. You come as you are, and you come to him. He will not cast out the one who comes. And if you have walked with him for years, ask him to make himself known to you again, more deeply and more truly, until your knowledge becomes love and your love becomes obedience.
Biblical fidelity check
These passages establish something plain: eternal life is bound up with knowing the only true God and Jesus Christ, and that knowledge is not mere information. It is a real relationship that shows itself in keeping his commandments, in love for others, and in continual prayer. They also establish that this knowledge is a gift of revelation, not something we manufacture. What they do not establish is that feelings are the measure of the knowledge of God, or that doctrinal content is unimportant. Both of those are misreadings, and both do damage.
A common misreading says that if you feel close to God, that feeling itself proves you know him, regardless of how you live. That reading is refuted by 1 John 2:3-6, which ties assurance of knowing him to keeping his commandments. Another misreading turns knowing God into a private inner experience with no connection to what Scripture actually says about him. But Jesus does not say we know an undefined divine presence. He says we know the only true God and him whom he sent. Personal experience matters, but it is always judged by the Word. A third misreading assumes knowledge of God is only for advanced believers, when Scripture presents it as the very content of eternal life, given to all who come to Christ in faith.
Other passages that speak to John 17:3
These passages open up the same theme from different angles. The Word of life is what makes fellowship with God possible, since the apostles proclaimed what they had seen and heard. Fellowship with God also requires honesty about sin, as the true state of our confession makes clear. That honesty leads us to God's promise of confession, forgiveness, and cleansing, which restores the relationship we were made for. Yet this relationship is not compatible with everything. The line drawn between love for God and love for the world shows that healthy knowledge of God orders our loves. Read together, these texts show that knowing God is a real relationship, cleansed by Christ, lived honestly, and set on the right object.
Frequently asked questions
Does knowing God mean simply feeling close to him?
No, though feeling close to him may accompany it. 1 John 2:3-6 ties the assurance of knowing God to keeping his commandments. Feelings come and go, and they can be shaped by health, temperament, and circumstances. A more reliable evidence is the direction of your life: whether you are turning from sin and toward Christ, whether you love the people around you, and whether his word is becoming more precious. Relationship with God is real, and nearness to him is a good thing to desire, but feelings alone are not a safe test of spiritual reality.
Is knowledge of God reserved for mature believers?
No. Jesus states in John 17:3 that knowing the only true God and himself is eternal life, which means it is the possession of every believer from the first moment of faith. What grows over time is depth, not possession. A new Christian and a seasoned one both know God truly, but the seasoned one knows him more. The Bible speaks of knowledge maturing, not of a stage where it begins. If you have come to Christ, you already know the true God in the only way anyone truly does, through his Son, and you are invited to keep going deeper.
How can I grow in knowing God without drifting into pride?
First, remember that this knowledge is a gift of revelation, not an achievement, so there is nothing to boast about. Second, watch the test of obedience and humility. Jeremiah 9:23-24 warns against glorying in wisdom, might, or riches, and says the only true ground of glorying is knowing God, who practices steadfast love, justice, and righteousness. The more you know him, the more clearly you will see your own need of mercy. Let that drive you to prayer and to mercy toward others rather than to comparison or self-congratulation.
