Untitled Sermon (5)

The Bible Knowledge Commentary 6:39–45

Jesus also pointed out that a man’s words will eventually tell what kind of man he is (vv. 43–45). Just as people know the kind of tree by the fruit it bears, so people know from what a person says whether he is righteous or not. In this case fruit stands for what is said, not what is done: out of the overflow of his heart his mouth speaks.

The New Bible Commentary 6:12–49 The Teaching of Jesus to His Disciples

Good conduct can come only out of a good heart. It is as foolish to expect good fruit to be produced by bad trees

Gospel according to Luke I–IX: Introduction, Translation and Notes Notes

The mouth reveals what the heart contains, i.e. the thoughts of the human mind.