"The happiness of your life depends upon the quality of your thoughts: therefore, guard accordingly, and take care that you entertain no notions unsuitable to virtue and reasonable nature."

"The greatest inventions were at first but the rudiments of experiments."

"As for yourself, whom I have the honour to know, you are a person of distinction, and would have been an ornament to any court in Europe."

"Complaint is the largest tribute Heaven receives, and the sincerest part of our devotion."

"I am not concerned to prove the justice of my opinion, but to show its usefulness."