Theories pass. The frog remains.

I don't judge a regime by the damning criticism of the opposition, but by the ingenuous praise of the partisan.

We spend our time envying people whom we wouldn't wish to be.

One kills a man, one is an assassin; one kills millions, one is a conqueror; one kills everybody, one is a god.

One must credit an hypothesis with all that has had to be discovered in order to demolish it.

In our ideals we unwittingly reveal our vices.

A few great minds are enough to endow humanity with monstrous power, but a few great hearts are not enough to make us worthy of using it.