“No man ever threw away life while it was worth keeping.”

“While Newton seemed to draw off the veil from some of the mysteries of nature, he showed at the same time the imperfections of the mechanical philosophy, so agreeable to the natural vanity and curiosity of men; and thereby restored her ultimate secrets to that obscurity, in which they ever did and ever will remain.”

“But the life of a man is of no greater importance to the universe than that of an oyster.”

“If my life be not my own, it were criminal for me to put it in danger, as well as to dispose of it; nor could one man deserve the appellation of hero, whom glory or friendship transports into the greatest dangers, and another merit the reproach of wretch or misereant who puts a period to his life, from the same or like motives.”

“Amidst all this bustle it is not reason, which carries the prize, but eloquence; and no man needs ever despair of gaining proselytes to the most extravagant hypothesis, who has art enough to represent it in any favourable colours. The victory is not gained by the men at arms, who manage the pike and the sword; but by the trumpeters, drummers, and musicians of the army.”

“A wise man apportions his beliefs to the evidence.”

“Be a philosopher, but amid all your philosophy be still a man.”