“The investigation of the meaning of words is the beginning of education”

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

“Not to unlearn what you have learned is the most necessary kind of learning.”

“The hours of folly are measured by the clock, but of wisdom no clock can measure.”

“One must be a wise reader to quote wisely and well”

“Who knows, the mind has the key to all things besides”