Reconciliation is the change from hostility to peace, and in Paul's letters it is something God does to us, not something we do for God.
In English, reconciliation stretches from patching up an argument to a term accountants use for balancing two ledgers. The main Bible word behind it, Greek katallagē, actually keeps that commercial flavour: it started as a word for exchanging money, then widened to mean trading enmity for friendship. Paul uses it almost exclusively, and always as an act done from one side toward the other, not a mutual meeting in the middle.
A different word, diallassomai, shows up once, in Matthew 5:24, for two people settling a grudge between themselves - the ordinary, two-way sense English speakers usually have in mind. Paul's own compound, apokatallassō, in Ephesians and Colossians, pushes further still: hostile parties, once genuinely at odds, brought fully back together. The Old Testament has no real equivalent term; where older English Bibles use 'reconciliation' for Hebrew kipper (Daniel 9:24, Ezekiel 45), they're borrowing the word for a quite different idea, the ritual covering of guilt, not the settling of a quarrel.
For if, when we were enemies of God, we were reconciled to Him through the death of His Son, how much more, having been reconciled, shall we be saved through His life! Not only that, but we also rejoice in God through our Lord Jesus Christ, through whom we have now received reconciliation.
Reconciliation happens through Christ's death while we were still enemies, not through our own change of heart.
All this is from God, who reconciled us to Himself through Christ and gave us the ministry of reconciliation: that God was reconciling the world to Himself in Christ, not counting men’s trespasses against them. And He has committed to us the message of reconciliation.
The clearest statement that God reconciles the world to himself and hands believers the message, not the initiative.
and reconciling both of them to God in one body through the cross, by which He put to death their hostility.
Paul's intensified compound apokatallassō describes two hostile groups fully brought into one body.
leave your gift there before the altar. First go and be reconciled to your brother; then come and offer your gift.
The one place using diallassomai, the ordinary mutual sense of settling a grudge between people.
Most English versions render katallassō and katallagē as 'reconcile' and 'reconciliation' (Romans 5, 2 Corinthians 5), which is accurate but flattens the difference from diallassomai's mutual patching-up in Matthew 5:24. Older versions like the KJV also use 'reconciliation' for Hebrew kipper in Daniel and Ezekiel, importing a relational English word into what is really a ritual atonement concept, blurring two distinct ideas under one label.
People often hear 'reconciliation' and picture two equal parties meeting halfway, as if we reconcile ourselves to God through effort or feeling. Paul's grammar says the opposite: God is the subject who reconciles, we are the object who receives it (2 Corinthians 5:18-19). The initiative and the action both run one direction, from God toward us, not the reverse.
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