KJV:
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.
NASB:
If the axe is dull and he does not sharpen its edge, then he must exert more strength. Wisdom has the advantage of giving success.
KJV:
In those days they shall say no more, The fathers have eaten a sour grape, and the children's teeth are set on edge.
NASB:
"In those days they will not say again, 'The fathers have eaten sour grapes, And the children's teeth are set on edge.'
KJV:
But every one shall die for his own iniquity: every man that eateth the sour grape, his teeth shall be set on edge.
NASB:
"But everyone will die for his own iniquity; each man who eats the sour grapes, his teeth will be set on edge.
KJV:
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?
NASB:
"What do you mean by using this proverb concerning the land of Israel, saying, 'The fathers eat the sour grapes, But the children's teeth are set on edge '?