'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.

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.

He who has a love for silver never has enough silver, or he who has love for wealth, enough profit. This again is to no purpose.