“The adjective is the enemy of the noun.”

“Doubt is not a pleasant condition but certainty is an absurd one.”

“The happiest of all lives is a busy solitude.” [letter to Frederick the Great, Aug. 1751]

“No problem can withstand the assault of sustained thinking.”

“Our wretched species is so made that those who walk on the well-trodden path always throw stones at those who are showing a new road.”

“To succeed in the world it is not enough to be stupid. You must also be well-mannered.”