There is in fact a true law namely right reason, which is in accordance with nature, applies to all men and is unchangeable and eternal. ... It will not lay down one rule at Rome and another at Athens, nor will it be one rule today and another tomorrow. But there will be one law eternal and unchangeable binding all times and upon all peoples.
Not to know what happened before you were born is to be a child forever. For what is the time of a man, except it be interwoven with that memory of ancient things of a superior age?
We can more easily avenge an injury than requite a kindness; on this account, because there is less difficulty in getting the better of the wicked than in making one's self equal with the good.
No man can be brave who thinks pain the greatest evil; nor temperate, who considers pleasure the highest god.
[Lat., Fortis vero, dolorem summum malum judicans; aut temperans, voluptatem summum bonum statuens, esse certe nullo modo potest.]