For to us a child is born, to us a son is given, and the government will be on his shoulders. And he will be called Wonderful Counselor, Mighty God, Everlasting Father, Prince of Peace. -Isaiah 9:6

For, Whoever would love life and see good days must keep their tongue from evil and their lips from deceitful speech. They must turn from evil and do good; they must seek peace and pursue it. -1 Peter 3:10-11

…or something like this:

No discipline seems pleasant at the time, but painful. Later on, however, it produces a harvest of righteousness and peace for those who have been trained by it. -Hebrews 12:11

But the wisdom that comes from heaven is first of all pure; then peace-loving, considerate, submissive, full of mercy and good fruit, impartial and sincere. -James 3:17