Anybody who has been seriously engaged in scientific work of any kind realizes that over the entrance to the gates of the temple of science are written the words: 'Ye must have faith.'

Anthropology demands the open-mindedness with which one must look and listen, record in astonishment and wonder that which one would not have been able to guess.

There is a single light of science, and to brighten it anywhere is to brighten it everywhere.

If a man's wit be wandering, let him study the mathematics.

A fact is a simple statement that everyone believes. It is innocent, unless found guilty. A hypothesis is a novel suggestion that no one wants to believe. It is guilty, until found effective.