Not just one:
Colossians 3:21 Fathers, provoke not your children to anger, lest they be discouraged.
Corinthians 2 5:7 For we walk by faith, not by sight.
Romans 12:20 If thine enemy hungers, feed him; if he thirsts, give him drink.
Proverbs 15:1 A soft answer turneth away wrath, but grievous...