To revolt is a natural tendency of life. Even a worm turns against the foot that crushes it. In general, the vitality and relative dignity of an animal can be measured by the intensity of its instinct to revolt.

I am truly free only when all human beings, men and women, are equally free. The freedom of other men, far from negating or limiting my freedom, is, on the contrary, its necessary premise and confirmation.

But here steps in Satan, the eternal rebel, the first freethinker and the emancipator of worlds. He makes man ashamed of his bestial ignorance and obedience; he emancipates him, stamps upon his brow the seal of liberty and humanity, in urging him to disobey and eat of the fruit of knowledge.

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.

The truth is that the whole life of the worker is simply a continuous and dismaying succession of terms of serfdom - voluntary from the juridical point of view but compulsory in the economic sense - broken up by momentarily brief interludes of freedom accompanied by starvation; in other words, it is real slavery.

Religion is a collective insanity.

Everything that lives, does so under the categorical condition of decisively interfering in the life of someone else.