Ecclesiastes 5:10-12

He who loves money will not be satisfied with money, nor he who loves abundance with its gain. This too is vanity (emptiness). When good things increase, those who consume them increase. So what advantage is there to their owners except to see them with their eyes? The sleep of a working man is sweet, whether he eats little or much; but the full stomach (greed) of the rich [who hungers for even more] will not let him sleep.