Proverbs 16:23
The heart of the wise teacheth his mouth, and addeth learning to his lips.
Proverbs 15:28
The heart of the righteous studieth to answer: but the mouth of the wicked poureth out evil things.
Psalm 37:30-31
The mouth of the righteous speaketh wisdom, and his tongue talketh of judgment.
Psalm 45:1
{To the chief Musician upon Shoshannim, for the sons of Korah, Maschil, A Song of loves.} My heart is inditing a good matter: I speak of the things which I have made touching the king: my tongue is the pen of a ready writer.
Proverbs 22:17-18
Bow down thine ear, and hear the words of the wise, and apply thine heart unto my knowledge.
Matthew 12:34-35
O generation of vipers, how can ye, being evil, speak good things? for out of the abundance of the heart the mouth speaketh.
Colossians 3:16
Let the word of Christ dwell in you richly in all wisdom; teaching and admonishing one another in psalms and hymns and spiritual songs, singing with grace in your hearts to the Lord.