Science is a cemetery of dead ideas, even though life may issue from them.

Suffering is the substance of life and the root of personality, for it is only suffering that makes us persons.

Faith which does not doubt is dead faith.

The will, the will not ever to die, the refusal to resign oneself to death, ceaselessly builds the house of life while the keen blasts and icy winds of reason unceasingly batter at the structure and beat it down.

Chemistry ought to be not for chemists alone.

Use harms and even destroys beauty. The noblest function of an object is to be contemplated.

If a person never contradicts himself, it must be that he says nothing.