It is a sure evidence of a good book if it pleases us more and more as we grow older.

Much can be inferred about a man from his mistress: in her one beholds his weaknesses and his dreams.

The highest level than can be reached by a mediocre but experienced mind is a talent for uncovering the weaknesses of those greater than itself.

Nothing puts a greater obstacle in the way of the progress of knowledge than thinking that one knows what one does not yet know.

One's first step in wisdom is to question everything - and one's last is to come to terms with everything.

We have to believe that everything has a cause, as the spider spins its web in order to catch flies. But it does this before it knows there are such things as flies.

There is something in our minds like sunshine and the weather, which is not under our control. When I write, the best things come to me from I know not where.