Human altruism which is not egoism, is sterile.

Each reader reads only what is already within himself. The book is only a sort of optical instrument which the writer offers to the reader to enable the latter to discover in himself what he would not have found but for the aid of the book.

So we don't believe that life is beautiful because we don't recall it but if we get a whiff of a long-forgotten smell we are suddenly intoxicated and similarly we think we no longer love the dead because we don't remember them but if by chance we come across an old glove we burst into tears.

We are less justified in saying that the thinking life of humanity is a miraculous perfectioning of animal and physical life than that it is an imperfection in the organization of spiritual life as rudimentary as the communal existence of protozoa in colonies.

Always try to keep a patch of sky above your life.

People don't know when they are happy. They're never so unhappy as they think they are.

Happiness is beneficial for the body, but it is grief that develops the powers of the mind.