Money is none of the wheels of trade; it is the oil which renders the motion of the wheels more smoothe and easy. David Hume (1711-1776)

The chief value of money lies in the fact that one lives in a world in which it is overestimated. H. L. Mencken (1880-1956)

You must spend money, if you wish to make money. Titus Maccius Plautus (third century B.C.)