Proverbs 15:1-2

A soft answer turns away wrath, But a harsh word stirs up anger. The tongue of the wise uses knowledge rightly, But the mouth of fools pours forth foolishness.

Matthew 18:15-17

If your brother sins against you, go and tell him his fault, between you and him alone. If he listens to you, you have gained your brother.But if he does not listen, take one or two others along with you, that every charge may be established by the evidence of two or three witnesses. If he refuses to listen to them, tell it to the church.

Proverbs 16:21

The wise in heart will be called prudent, And sweetness of the lips increases learning.

Ephesians 4:15

Instead, speaking the truth in love, we will grow to become in every respect the mature body of him who is the head, that is, Christ.