No more fiction, for now we calculate; but that we may calculate, we had to make fiction first.

Beware in the presence of cats: they never give, they do not even retaliate--they only reply, and purr in doing so.

He who possesses greatness is cruel towards his secondary virtues and considerations.

Again and again I am brought up against it, and again and again I resist it: I don't want to believe it, even though it is almost palpable: the vast majority lack an intellectual conscience; indeed, it often seems to me that to demand such a thing is to be in the most populous cities as solitary as in the desert.

Is man merely a mistake of God's? Or God merely a mistake of man?

There will always be rocks in the road ahead of us. They will be stumbling blocks or stepping stones; it all depends on how you use them.

In pain there is as much wisdom as in pleasure: like the latter it is one of the best self preservatives of a species.