Ecclesiastes 3:1–8: A Time for War and Peace
Ecclesiastes 3:1–8 sets birth and death, war and peace inside one ordered pattern of seasons. The poem describes the world as it is; it does not hand anyone permission to harm.
Matthew 5:38–48: Enemy Love and War
Jesus calls his disciples to answer hostility with generosity, prayer and love, grounded in the character of God rather than in a promise of safety. The passage addresses the disciple's own conduct toward those who wrong him, not the powers of the state.
How should Christians think about war and military service? A Biblical Guide
John the Baptist answers soldiers and tax collectors with commands about how they do their work, not whether they should leave it. The passage calls for visible repentance inside a person's station and points past John to the mightier one who comes.