Human nature is so constituted that the propensity for evil is always intensified by external circumstances, and the morality of the individual depends much more on the conditions of his existence and the environment in which he lives than on his own will.

There is only one power and one dictatorship whose organisation is salutary and feasible: it is that collective, invisible dictatorship of those who are allied in the name of our principle.

Anyone who makes plans for after the revolution is a reactionary.

We must overthrow the material and moral conditions of our present-day life. . . . We must first purify our atmosphere and completely transform the milieu in which we live; for it corrupts our instinct and our will, and constricts our heart and our intelligence

We must spread our principles, not with words but with deeds, for this is the most popular, the most potent, and the most irresistible form of propaganda.

By striving to do the impossible, man has always achieved what is possible. Those who have cautiously done no more than they believed possible have never taken a single step forward.

The organization of society is always and everywhere the unique cause of the crimes committed by individuals.