The neuro-physiological organization which we call instinct functions in a blindly mechanical way, particularly apparent when its function goes wrong.

Man appears to be the missing link between anthropoid apes and human beings.

We do not take humor seriously enough.

It is a good morning exercise for a research scientist to discard a pet hypothesis every day before breakfast. It keeps him young.

The distance at which all shooting weapons take effect screens the killer against the stimulus sensation which would otherwise activate his killing inhibitions. The deep, emotional layers of our personality simply do not register the fact that the crooking of the finger to release a shot tears the entrails of another man.

...he who has seen the intimate beauty of nature cannot tear himself away from it again. He must become either a poet or a naturalist and, if his eyes are keen and his powers of observation sharp enough, he may well become both.

The fidelity of a dog is a precious gift demanding no less binding moral responsibilities than the friendship of a human being.