We find it easy to believe that praise is sincere: why should anyone lie in telling us the truth?

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

We are not naïve enough to ask for pure men; we ask merely for men whose impurity does not conflict with the obligations of their job.

It is sometimes important for science to know how to forget the things she is surest of.

It takes a very deep-rooted opinion to survive unexpressed.

The books one has written in the past have two surprises in store: one couldn't write them again, and wouldn't want to.

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