"I write to thee on this subject, , because I am angry at a book which I have just left, which is so large, that it seems to contain universal science, but it hath almost split my head, without teaching me anything."

“I acknowledge that history is full of religious wars: but we must distinguish; it is not the multiplicity of religions which has produced wars; it is the intolerant spirit animating that which believed itself in the ascendant.”

“There are only two cases in which war is just: first, in order to resist the aggression of an enemy, and second, in order to help an ally who has been attacked.”

“Not to be loved is a misfortune, but it is an insult to be loved no longer.”

“will make the king believe that three are only one, that the bread he eats is not bread...and a thousand other things of the same kind.”

“The laws of Rome had wisely divided public power among a large number of magistracies, which supported, checked and tempered each other. Since they all had only limited power, every citizen was qualified for them, and the people — seeing many persons pass before them one after the other — did not grow accustomed to any in particular. But in these times the system of the republic changed. Through the people the most powerful men gave themselves extraordinary commissions — which destroyed the authority of the people and magistrates, and placed all great matters in the hands of one man, or a few.”

“In a free nation, it matters not whether individuals reason well or ill; it is sufficient that they do reason. Truth arises from the collision and from hence springs liberty, which is a security from the effects of reasoning.”