Proverbs 16:23
The heart of the wise makes his speech judicious and adds persuasiveness to his lips.
Proverbs 15:28
The heart of the righteous ponders how to answer, but the mouth of the wicked pours out evil things.
Psalm 37:30-31
The mouth of the righteous utters wisdom, and his tongue speaks justice.
Psalm 45:1
My heart overflows with a pleasing theme; I address my verses to the king; my tongue is like the pen of a ready scribe.
Proverbs 22:17-18
Incline your ear, and hear the words of the wise, and apply your heart to my knowledge,
Matthew 12:34-35
You brood of vipers! How can you speak good, when you are evil? For out of the abundance of the heart the mouth speaks.
Colossians 3:16
Let the word of Christ dwell in you richly, teaching and admonishing one another in all wisdom, singing psalms and hymns and spiritual songs, with thankfulness in your hearts to God.