Matthew 12:34-35

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 the Christ dwell in you richly in all wisdom, by teaching and admonishing one another in psalms, hymns, and spiritual songs, singing with gratitude in your hearts to the Lord.

Treasury of Scripture Knowledge

Summary

The heart of the wise teacheth his mouth, and addeth learning to his lips.

Bible References

Heart

Matthew 12:34
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 the Christ dwell in you richly in all wisdom, by teaching and admonishing one another in psalms, hymns, and spiritual songs, singing with gratitude in your hearts to the Lord.