Man's characteristic privilege is that the bond he accepts is not physical but moral; that is, social. He is governed not by a material environment brutally imposed on him, but by a conscience superior to his own, the superiority of which he feels. Because the greater, better part of his existence transcends the body, he escapes the body's yoke, but is subject to that of society.

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

Social life comes from a double source, the likeness of consciences and the division of social labour.

What history teaches us is that man does not change arbitrarily; he does not transform himself at will on hearing the voices of inspired prophets. The reason is that all change, in colliding with the inherited institutions of the past, is inevitably hard and laborious; consequently it only takes place in response to the demands of necessity. For change to be brought about it is not enough that it should be seen as desirable; it must be the product of changes within the whole network of diverse casual relationships which then determine the situation of man.

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.

Man is a moral being, only because he lives in society. Let all social life disappear and morality will disappear with it.