Men's ideas are the most direct emanations of their material state.

Crack-brained meddling by the authorities [can] aggravate an existing crisis.

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

We know that violent measures against religion are nonsense; but this is an opinion: as socialism grows, religion will disappear. Its disappearance must be done by social development, in which education must play a part.

Experience praises the most happy the one who made the most people happy.

The Communists have no need to introduce free love; it has existed almost from time immemorial.

Labour is ... not the only source of material wealth, i.e, of the use-values it produces. As William Petty says, Labour is the father of material wealth, the earth is its mother.