1 Corinthians 7:12–16: Faith and Marriage
Paul tells believers married to unbelieving spouses not to initiate a departure when the spouse is content to stay, and to let peace rule if the spouse leaves. The passage speaks to mental illness in marriage only by analogy, through its call to patient faithfulness without a guaranteed outcome.
Divorce and an Unbelieving Spouse in 1 Corinthians 7
Paul tells a believer married to an unbeliever not to initiate a departure while the spouse is content to stay. If the unbeliever walks away, the believer is not held in bondage or guilt for a separation they did not choose.
1 Corinthians 7:10–16 on Separation and Divorce
Paul treats the command against a spouse leaving as the Lord's own word, not his own counsel, and he keeps the door open after a separation. Where an unbelieving spouse departs, the believer is not bound, and the outcome is left with God.