“Your enemies can kill you, but only your friends can hurt you.”

“What is morally wrong can never be advantageous, even when it enables you to make some gain that you believe to be to your advantage. The mere act of believing that some wrongful course of action constitutes an advantage is pernicious.”

“Every man can tell how many goats or sheep he possesses, but not how many friends.”

“Any man can make mistakes, but only an idiot persists in his error”

“He only employs his passion who can make no use of his reason.”

“In this statement, my Scipio, I build on your own admirable definition, that there can be no community, properly so called, unless it be regulated by a combination of rights. And by this definition it appears that a multitude of men may be just as tyrannical as a single despot and indeed this is the most odious of all tyrannies, since no monster can be more barbarous than the mob, which assumes the name and mask of the people.”

“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.”