What a person is for himself, what abides with him in his loneliness and isolation, and what no one can give or take away from him, this is obviously more essential for him than everything that he possesses or what he may be in the eyes of others.

Physics is unable to stand on its own feet, but needs a metaphysics on which to support itself, whatever fine airs it may assume towards the latter.

Life to the great majority is only a constant struggle for mere existence, with the certainty of losing it at last.

The bad thing about all religions is that, instead of being able to confess their allegorical nature, they have to conceal it.

To desire immortality for the individual is really the same as wanting to perpetuate an error forever.

Suicide may also be regarded as an experiment - a question which man puts to Nature, trying to force her to answer. The question is this: What change will death produce in a man's existence and in his insight into the nature of things? It is a clumsy experiment to make; for it involves the destruction of the very consciousness which puts the question and awaits the answer.

No rose without a thorn but many a thorn without a rose.