We have no words for speaking of wisdom to the stupid. He who understands the wise is wise already.

Some people feel with their heads and think with their hearts.

There are people who think that everything one does with a serious face is sensible.

We cannot remember too often that when we observe nature, and especially the ordering of nature, it is always ourselves alone we are observing.

Man is a masterpiece of creation, if only because no amount of determinism can prevent him from believing that he acts as a free being.

Most men of education are more superstitious than they admit - nay, than they think.

To grow wiser means to learn to know better and better the faults to which this instrument with which we feel and judge can be subject.