Proverbs 15:28The heart of the righteous studieth to answer: but the mouth of the wicked poureth out evil things.
Psalms 37:30-31The mouth of the righteous speaketh wisdom, and his tongue talketh of judgment. The law of his God is in his heart; none of his steps shall slide.
Psalms 45:1My heart is inditing a good matter: I speak of the things which I have made touching the king: my tongue is the pen of a ready writer.
Proverbs 22:17-18Bow down thine ear, and hear the words of the wise, and apply thine heart unto my knowledge. For it is a pleasant thing if thou keep them within thee; they shall withal be fitted in thy lips.
Matthew 12:34-35O generation of vipers, how can ye, being evil, speak good things? for out of the abundance of the heart the mouth speaketh. A good man out of the good treasure of the heart bringeth forth good things: and an evil man out of the evil treasure bringeth forth evil things.
Colossians 3:16Let the word of Christ dwell in you richly in all wisdom; teaching and admonishing one another in psalms and hymns and spiritual songs, singing with grace in your hearts to the Lord.