One might think that the money value of an invention constitutes its reward to the man who loves his work. But… I continue to find my greatest pleasure, and so my reward, in the work that precedes what the world calls success. – Thomas A. Edison

Money does not pay for anything, never has, never will. It is an economic axiom as old as the hills that goods and services can be paid for only with goods and services. – Albert Jay Nock, Memoirs of a Superfluous Man, 1943