A monomaniac is a sick person whose mentality is perfectly healthy in all respects but one; he has a single flaw, clearly localized. At times, for example, he has an unreasonable and absurd desire to drink or steal or use abusive language; but all his other acts and all his other thoughts are strictly correct.

This solidarity can grow only in inverse ratio to personality... Solidarity which comes from likenesses is at its maximum when the collective conscience completely envelops our whole conscience and coincides in all points with it... when this solidarity exercises its force, our personality vanishes, as our definition permits us to say, for we are no longer ourselves, but the collective life.

One does not advance when one walks toward no goal, or - which is the same thing - when his goal is infinity.

It is not human nature which can assign the variable limits necessary to our needs. They are thus unlimited so far as they depend on the individual alone. Irrespective of any external regulatory force, our capacity for feeling is in itself an insatiable and bottomless abyss.

It is science, and not religion, which has taught men that things are complex and difficult to understand.

Socialism is not a science, a sociology in miniature: it is a cry of pain.

We do not condemn it because it is a crime, but it is a crime because we condemn it.