Proverbs 16:23
The heart of the wise teaches his mouth, and adds learning to his lips.
Proverbs 15:28
The heart of the righteous studies to answer: but the mouth of the wicked pours out evil things.
Psalm 37:30-31
The mouth of the righteous speaks wisdom, and his tongue talks of justice.
Psalm 45:1
[To the Chief Musician upon shoshannim, for the Sons of Korah, a maschil, a song of loves.] My heart is overflowing with a good matter: I speak of the things which I have made concerning the king: my tongue is the pen of a ready scribe.
Proverbs 22:17-18
Bow down your ear, and hear the words of the wise, and apply your heart unto my knowledge.
Matthew 12:34-35
O generation of vipers, how can you, being evil, speak good things? for out of the abundance of the heart the mouth speaks.
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.