"I have often observed, that those who have a great esteem for their own opinions, are very apt to despise those of others."

"I have often observed that those who are most eager to gain applause, are generally the least deserving of it."

"I am not ashamed to confess that I have learned more from observation than from all the books I have ever read."

"I have endeavored to write not for the learned only, but for all ingenious persons."

"The true method of discovering the nature of things is by experiment."