'Enough' in the Bible

All things are full of weariness; man may not give their story: the eye has never enough of its seeing, or the ear of its hearing.

I decided to indulge in wine, while still remaining committed to wisdom. I also tried to indulge in foolishness, just enough to determine whether it was good for human beings under heaven given the short time of their lives.

It is one who is by himself, without a second, and without son or brother; but there is no end to all his work, and he has never enough of wealth. For whom, then, am I working and keeping myself from pleasure? This again is to no purpose, and a bitter work.

Whoever loves money will never have enough money. Whoever loves luxury will not be content with abundance. This also is pointless.