"As a proof of the admirable power of the mind, I may mention that I have been for some years training my mind to reject the evidence of my senses when they do not square with my preconceived notions."

"It is a wonderful fact that we can understand so much."

"If I have seen further than others, it is by standing upon the shoulders of giants."

"Man, with all his noble qualities, with sympathy which feels for the most debased, with benevolence which extends not only to other men but to the humblest living creature, with his god-like intellect…"

"I had no intention of writing an autobiography, but I found myself doing so."