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

Think? Why think! We have computers to do that for us.

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

It is horrible to see everything that one detested in the past coming back wearing the colors of the future.

Already at the origin of the species man was equal to what he was destined to become.

A body of work such as Pasteur's is inconceivable in our time: no man would be given a chance to create a whole science. Nowadays a path is scarcely opened up when the crowd begins to pour in.

Whether man is disposed to yield to nature or to oppose her, he cannot do without a correct understanding of her language