Proverbs 16:23
The heart of the wise instructs his mouth, and adds learning to his lips.
Proverbs 15:28
The heart of a righteous man meditates to answer, but the mouth of the wicked pours out evil things.
Psalm 37:30-31
The mouth of a righteous man talks of wisdom, and his tongue speaks justice.
Psalm 45:1
My heart overflows with a good matter. I speak the things which I have made concerning 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 to 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 speaks.
Colossians 3:16
Let the word of Christ dwell in you abundantly in all wisdom, teaching and admonishing yourselves in psalms and hymns and spiritual songs, singing by grace in your hearts to God.