Ecclesiastes 10:10; Ecclesiastes 12:3

Ecclesiastes 10:10

10 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.

Ecclesiastes 12:3

3 in the day that the watchmen of the house tremble, and mighty men stoop, the grinding ones stand idle because they are few, and those who look through windows grow dim;