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 brings out evil things.
Matthew Henry's Commentary on Matthew 12:34-35
Commentary on Matthew 12:33-37
(Read Matthew 12:33-37)
Men's language discovers what country they are of, likewise what manner of spirit they are of. The heart is the fountain, words are the streams. A troubled fountain, and a corrupt spring, must send forth muddy and unpleasant streams. Nothing but the salt of grace, cast into the spring, will heal the waters, season the speech, and purify the corrupt communication. An evil man has an evil treasure in his heart, and out of it brings forth evil things. Lusts and corruptions, dwelling and reigning in the heart, are an evil treasure, out of which the sinner brings forth bad words and actions, to dishonour God, and hurt others. Let us keep constant watch over ourselves, that we may speak words agreeable to the Christian character.