Cross reference
Proverbs 16:23
23 The heart of the wise instructs his mouth, And adds learning to his lips.
Proverbs 15:28
28 The heart of the righteous weighs answers, But the mouth of the wicked gushes out evil.
Matthew 12:34-35
34 You offspring of vipers, how can you, being evil, speak good things? For out of the abundance of the heart, the mouth speaks.
35 The good man out of his good treasure brings out good things, and the evil man out of his evil treasure{TR adds "of the heart"} brings out evil things.
Psalms 37:30-31
30 The mouth of the righteous talks of wisdom. His tongue speaks justice.
31 The law of his God is in his heart. None of his steps shall slide.
Psalms 45:1
1 > My heart overflows with a noble theme. I recite my verses for the king. My tongue is like the pen of a skillful writer.
Proverbs 22:17-18
17 Turn your ear, and listen to the words of the wise. Apply your heart to my teaching.
18 For it is a pleasant thing if you keep them within you, If all of them are ready on your lips.
Colossians 3:16
16 Let the word of Christ dwell in you richly; in all wisdom teaching and admonishing one another with psalms, hymns, and spiritual songs, singing with grace in your heart to the Lord.