Luke 6:44
For every tree is known by his own fruit. For of thorns men do not gather figs, nor of a bramble bush gather they grapes.
For every tree is known by its own fruit,.... Good and bad preachers are known by their doctrines, the one being agreeable, the other disagreeable to the word of God; and good and bad men are known by their lives and conversations: the grace of God revealed to good men, and wrought in them, teaches them to live soberly, righteously, and godly; a holy life is the fruit of grace, and an evidence of it; and the wickedness that is in the heart of unregenerate men, and even the hypocrisy of formal professors, will show themselves in the common and ordinary course of their conversations:
For of thorns men do not gather figs, nor of a bramble bush gather they grapes; nor can they be expected from them: and no more can an unregenerate man perform good works, or bring forth: fruits of righteousness acceptable unto God; for these require a knowledge of his will, obedience to it, a principle of grace, love to God, faith in Christ, and a view to the glory of God; all which are wanting in such a person.