And who knoweth whether he will be a wise man or a fool? yet shall he have rule over all my labour at which I have laboured, and wherein I have been wise under the sun. This also is vanity.

What profit hath he that worketh from that wherein he laboureth?

Enjoy life with the wife whom thou lovest all the days of the life of thy vanity, which he hath given thee under the sun, all the days of thy vanity; for that is thy portion in life, and in thy labour wherein thou art labouring under the sun.

If the iron be blunt, and one do not whet the edge, then must he apply more strength; but wisdom is profitable to give success.