'Profitable' in the Bible

I thought deeply about the effects of indulging myself with wine (all the while my mind was guiding me with wisdom) and the effects of behaving foolishly, so that I might discover what is profitable for people to do on earth during the few days of their lives.

Yet when I considered all the effort which I expended and the toil with which I toiled to do, then behold, "Everything [is] vanity and chasing wind! There is nothing profitable under the sun!"

Moreover the earth is every way profitable: the king himself is dependent upon the field.

Wisdom is as good as an inheritance, and profitable to them that see the sun.

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.