“The man who never alters his opinions is like standing water, and breeds reptiles of the mind”

“Where so many hours have been spent in convincing myself that I am right, is there not some reason to fear I may be wrong?”

“A true teacher defends his students against his own personal influences”

“My wife was too beautiful for words, but not for arguments.”

“Nothing is more deceitful than the appearance of humility. It is often only carelessness of opinion, and sometimes an indirect boast.””

“Without contraries is no progression.”