“The demand for certainty is one which is natural to man, but is nevertheless an intellectual vice.”

“With the wise man, what he has does not cease to be enjoyable because some one else has something else. Envy, in fact, is one form of vice, partly moral, partly intellectual, which consists in seeing things never in themselves but only in their relations”

“Flippancy, the most hopeless form of intellectual vice.”

“There is one vice of which no man in the world is free; which every one in the world loathes when he sees it in someone else; and of which hardly any people, except Christians, ever imagine that they are guilty themselves. […] There is no fault which makes a man more unpopular, and no fault which we are more unconscious of in ourselves.[…]The vice I am talking of is Pride or Self-Conceit: and the virtue opposite to it, in Christian morals, is called Humility.”

“And this accident came about...?"Through nature's unpredictability not man's incapacity. No errors were committed in our maneuvers. Nevertheless, we can't prevent a loss of balance from taking its toll. One may defy human laws, but no one can withstand the laws of nature.”

“There is nothing more unsociable than man, and nothing more sociable: unsociable by his vice, sociable by his nature.”