"My mind seems to have become a kind of machine for grinding general laws out of large collections of facts, but why this should have caused the atrophy of that part of the brain alone, on which the hi…"

"I have no great quickness of apprehension or wit which is so remarkable in some clever men."

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

"I have always felt a strong feeling of gratitude to those who have helped me in my work."

"I am a strong believer in the power of observation and the importance of collecting facts."