Man could not live if he were entirely impervious to sadness. Many sorrows can be endured only by being embraced, and the pleasure taken in them naturally has a somewhat melancholy character.

Each new generation is reared by its predecessor; the latter must therefore improve in order to improve its successor. The movement is circular.

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.

Science cannot describe individuals, but only types. If human societies cannot be classified, they must remain inaccessible to scientific description.

A religion is a unified system of beliefs and practices relative to sacred things, that is to say, things set apart and forbidden-beliefs and practices which unite into one single moral community called a Church, all those who adhere to them.

Our excessive tolerance with regard to suicide is due to the fact that, since the state of mind from which it springs is a general one, we cannot condemn it without condemning ourselves; we are too saturated with it not partly to excuse it.

Man seeks to learn, and man kills himself because of the loss of cohesion in his religious society; he does not kill himself because of his learning. It is certainly not the learning he acquires that disorganizes religion; but the desire for knowledge wakens because religion becomes disorganized.