Proverbs 16:23
The heart of the wise maketh his mouth intelligent, and upon his lips increaseth learning.
Proverbs 15:28
The heart of a righteous man studieth to answer; but the mouth of the wicked poureth out evil things.
Psalm 37:30-31
The mouth of the righteous proffereth wisdom, and his tongue speaketh judgment;
Psalm 45:1
{To the chief Musician. Upon Shoshannim. Of the sons of Korah. An instruction; a song of the Beloved.} My heart is welling forth with a good matter: I say what I have composed 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
Offspring of vipers! how can ye speak good things, being wicked? For of the abundance of the heart the mouth speaks.
Colossians 3:16
Let the word of the Christ dwell in you richly, in all wisdom teaching and admonishing one another, in psalms, hymns, spiritual songs, singing with grace in your hearts to God.