“Some people read because they are too lazy to think”

“Logic is the anatomy of thought”

“To prejudge other men's notions before we have looked into them is not to show their darkness but to put out our own eye”

“The thoughts that come often unsought, and, as it were, drop into the mind, are commonly the most valuable of any we have”

“The worst thing you can possibly do is worrying and thinking about what you could have done”

“We cannot remember too often that when we observe nature, and especially the ordering of nature, it is always ourselves alone we are observing”