Both Marx and Nietzsche understood that moral outrage is the last resort of the powerless. That is why Marx refused to issue moral condemnations of capitalism, preferring instead to lay out, calmly and ruthlessly, his reasons for believing that it is destined to be replaced by socialism. And that is why Nietzsche mocks Christianity for portraying its crucified Saviour as bait wriggling on a hook to catch unsuspecting souls.

— Robert Paul Wolff

The world economy would collapse if a significant number of people were to realize and then act on the realization that it is possible to enjoy many if not most of the things that they enjoy without first having to own them.

— Mokokoma Mokhonoana

Calvin:'It says here that 'religion is the opiate of the masses.'...What do you suppose that means?'Television: '...It means that Karl Marx hadn't seen anything yet.

— Bill Watterson

Marx called Darwin a plagiarist and Malthus a fraud. Now all Marxists are Malthusian Darwinists.

— A.E. Samaan

Marx hated weakness in men, and considered the making of moral judgements as the last resort of the weak. To say 'That is morally wrong' is implicitly to say ' I am powerless to stop that, so I will inveigh against it'.

— Paul Robert Wolff

To say that 'the worker has an interest in the rapid growth of capital', means only this: that the more speedily the worker augments the wealth of the capitalist, the larger will be the crumbs which fall to him, the greater will be the number of workers than can be called into existence, the more can the mass of slaves dependent upon capital be increased.

— Karl Marx

A use-value, or useful article, therefore, has value only because abstract human labour is objectified or materialized in it. How, then, is the magnitude of this value to be measured? By means of the quantity of the 'value-forming substance', the labour, contained in the article. This quantity is measured by its duration, and the labour-time is itself measured on the particular scale of hours, days etc.

— Karl Marx

As Karl Marx once noted: 'Hegel remarks somewhere that all great, world-historical facts and personages occur, as it were, twice. He forgot to add: the first time as tragedy, the second as farce.' William Jennings Bryan and the Scopes trial was a tragedy. The creationists and intelligent design theorists are a farce.

— Michael Shermer

As exchange-values, all commodities are merely definite quantities of congealed labour-time.

— Karl Marx

The world would not be in such a snarl, had Marx been Groucho instead of Karl.

— Irving Berlin