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.

JFB.