“Our intelligence cannot wall itself up alive, like a pupa in a chrysalis. It must at any cost keep on speaking terms with the universe that engendered it.”

“Work usually follows will.”

“Action may not always bring happiness, but there is no happiness without action. ”

“We must judge the tree by its fruit. The best fruits of the religious experience are the best things history has to offer. The highest flights of charity, devotion, trust, patience, and bravery to ...”

“The greatest discovery of any generation is that a human can alter his life by altering his attitude.”

“A great many people think they are thinking when they are merely rearranging their prejudices.”

“I do not know what I may appear to the world, but to myself I seem to have been only like a boy playing on the sea-shore, and diverting myself in now and then finding a smoother pebble or a prettie...”

“To know the history of science is to recognize the mortality of any claim to universal truth. ”

“The scientist only imposes two things, namely truth and sincerity, imposes them upon himself and upon other scientists.”