People who lead a lonely existence always have something on their minds that they are eager to talk about.

They say philosophers and wise men are indifferent. Wrong. Indifference is a paralysis of the soul, a premature death.

There is nothing more vulgar than a petty bourgeois life with its halfpence, its victuals, its futile talk, and its useless conventional virtue.

Man has been endowed with reason, with the power to create, so that he can add to what he's been given.

The desire to serve the common good must without fail be a requisite of the soul, a necessity for personal happiness; if it issuesnot from there, but from theoretical or other considerations, it is not at all the same thing.

I think that it would be less difficult to live eternally than to be deprived of sleep throughout life.

There is no national science, just as there is no national multiplication table; what is national is no longer science.