12:33 Either make the tree good, and its fruit good. The principle is announced in Mt 7:20 that the tree is known by its fruits. If his own life and works were evil, then he might be evil and aided by Satan, but if good, then his power was from God.
12:33 Either make the tree good and its fruit good: or make the tree corrupt and its fruit corrupt - That is, you must allow, they are both good, or both bad. - For if the fruit is good, so is the tree; if the fruit is evil, so is the tree also. For the tree is known by its fruit - As if he had said, Ye may therefore know me by my fruits. By my converting sinners to God, you may know that God hath sent me. Mt 7:16; Luke 6:43.
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.
