If the iron be blunt, and he do not whet the edge, then must he put to more strength: but wisdom is profitable to direct.

In those days they shall say no more, The fathers have eaten a sour grape, and the children's teeth are set on edge.

But every one shall die for his own iniquity: every man that eateth the sour grape, his teeth shall be set on edge.

What mean ye, that ye use this proverb concerning the land of Israel, saying, The fathers have eaten sour grapes, and the children's teeth are set on edge?