Matthew 12:34-35

O race of vipers, how can ye speak good things, who are yourselves so wicked? for out of the abundance of the heart the mouth speaketh.

Colossians 3:16

Let the word of Christ dwell in you richly in all wisdom; teaching and admonishing one another by psalms, and hymns, and spiritual songs, with gratitude singing 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
O race of vipers, how can ye speak good things, who are yourselves so wicked? for out of the abundance of the heart the mouth speaketh.
Colossians 3:16
Let the word of Christ dwell in you richly in all wisdom; teaching and admonishing one another by psalms, and hymns, and spiritual songs, with gratitude singing in your hearts to the Lord.