I used to go away for weeks in a state of confusion.

But hereditary diseases and some other facts make me believe that the rule has a wider extension, and that, when there is no apparent reason why a peculiarity should appear at any particular age, yet it does tend to appear in the offspring at the same period at which it first appeared in the parent. I believe this rule to be of the highest importance in explaining the laws of embryology.

Most people say that it is the intellect which makes a great scientist. They are wrong: it is character.

The most beautiful experience we can have is the mysterious. It is the source of all true art and science.

I have just got a new theory of eternity.

The man of science is a poor philosopher.