“En un mot, nos mains tâchent de faire dans la nature, pour ainsi dire, une autre nature.”

“Il y a encore de certains devoirs à remplir envers même de qui nous avons reçu une injure; car la vengeance et la punition ont aussi leurs bornes. Je ne sais même si repentir de celui qui a fait l'injure ne suffirait pas et pour l'empêcher d'en faire une semblable à l'avenir et pour retenir les autres dans le devoir.”

“Time obliterates the fictions of opinion and confirms the decisions of nature.”

“The life given us, by nature is short; but the memory of a well-spent life is eternal.”

“True law is right reason in agreement with nature; it is of universal application, unchanging and everlasting; it summons to duty by its commands, and averts from wrongdoing by its prohibitions.”

“For while we are enclosed in these confinements of the body, we perform as a kind of duty the heavy task of necessity; for the soul from heaven has been cast down from its dwelling on high and sunk, as it were, into the earth, a place just the opposite to godlike nature and eternity. But I believe that the immortal gods have sown souls in human bodies so there might exist beings to guard the world and after contemplating the order of heaven, might imitate it by their moderation and steadfastness in life.”

“As for myself, I can only exhort you to look on Friendship as the most valuable of all human possessions, no other being equally suited to the moral nature of man, or so applicable to every state and circumstance, whether of prosperity or adversity, in which he can possibly be placed. But at the same time I lay it down as a fundamental axiom that "true Friendship can only subsist between those who are animated by the strictest principles of honour and virtue." When I say this, I would not be thought to adopt the sentiments of those speculative moralists who pretend that no man can justly be deemed virtuous who is not arrived at that state of absolute perfection which constitutes, according to their ideas, the character of genuine wisdom. This opinion may appear true, perhaps, in theory, but is altogether inapplicable to any useful purpose of society, as it supposes a degree of virtue to which no mortal was ever capable of rising.”