"As He said, a thistle cannot produce figs."

Creative Commons AttributionThistle - Credit: freefoto.com
Taken from Matthew 7:15-17 (KJV), a portion of the Sermon on the Mount: "Beware of false prophets, which come to you in sheep's clothing, but inwardly they are ravening wolves. Ye shall know them by their fruits. Do men gather grapes of thorns, or figs of thistles? Even so every good tree bringeth forth good fruit; but a corrupt tree bringeth forth evil fruit."