Force is the midwife of every old society pregnant with a new one.

Machines were, it may be said, the weapon employed by the capitalists to quell the revolt of specialized labor.

The true law of economics is chance, and we learned people arbitrarily seize on a few moments and establish them as laws.

Men make their own history but not in circumstances of their own choosing.

The ruling ideas of each age have ever been the ideas of its ruling class.

A commodity appears at first sight an extremely obvious, trivial thing. But its analysis brings out that it is a very strange thing, abounding in metaphysical subtleties and theological niceties.

Reason has always existed, but not always in a reasonable form.