This book of the law shall not depart from thy mouth; and thou shalt meditate upon it day and night, that thou mayest take heed to do according to all that is written therein; for then shalt thou have good success in thy ways, and then shalt thou prosper.

And I saw all labour, and all success of work, that it is man's jealousy of his neighbour. This also is vanity and pursuit of the wind.

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.