Can a fig tree, my brothers, bear olives, or a grapevine produce figs? Neither can a salt pond yield fresh water.
"Either make the tree good and its fruit good, or make the tree bad and its fruit bad, for the tree is known by its fruit.
Yet I planted you a choice vine, wholly of pure seed. How then have you turned degenerate and become a wild vine?
And seeing a fig tree by the wayside, he went to it and found nothing on it but only leaves. And he said to it, "May no fruit ever come from you again!" And the fig tree withered at once.
Does a spring pour forth from the same opening both fresh and salt water?