От Матфея 7:16

Ye shall know them by their fruits--not their doctrines--as many of the elder interpreters and some later ones explain it--for that corresponds to the tree itself; but the practical effect of their teaching, which is the proper fruit of the tree. Do men gather grapes of thorns--any kind of prickly plant. or figs of thistles?--a three-pronged variety. The general sense is obvious--Every tree bears its own fruit.

This chapter continues and concludes Christ's sermon on the mount, which is purely practical, directing us to order our conversation aright, both toward God and man; for the design of the Christian religion is to make men good, every way good. We have, I. Some rules concerning censure and reproof (Mat 7:1-6). II. Encouragements given us to pray to God for what we need (Mat 7:7-11). III. The necessity of strictness in conversation urged upon us (Mat 7:12-14). IV. A caution given us to take heed of false prophets (Mat 7:15-20). V. The conclusion of the whole sermon, showing the necessity of universal obedience to Christ's commands, without which we cannot expect to be happy (Mat 7:21-27). VI. The impression which Christ's doctrine made upon his hearers (Mat 7:28, Mat 7:29).

7:16-17 Good and bad fruit refers to moral behavior (see 3:8, 10; 12:33-37; 13:8; 21:43; Gal 5:19-23).