Proverbs 16:23
The heart of the wise instructeth 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 talketh of wisdom, And his tongue speaketh justice.
Psalm 45:1
My heart overfloweth with a goodly matter; I speak the things which I have made touching the king: My tongue is the pen of a ready writer.
Proverbs 22:17-18
Incline thine ear, and hear the words of the wise, And apply thy heart unto my knowledge.
Matthew 12:34-35
Ye offspring 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 with psalms and hymns and'spiritual songs, singing with grace in your hearts unto God.