Man is the measure of all things: of things which are, that they are, and of things which are not, that they are not.
Those who are able to see beyond the shadows and lies of their culture will never be understood, let alone believed, by the masses.
Then as for those who gaze upon many beautiful things but don't see the beautiful itself, and aren't even capable of following someone else who leads them to it, and upon many just things but not the just itself, and all the things like that, we'll claim that they accept the seeming of everything but discern nothing of what they have opinions about.
No man should bring children into the world who is unwilling to persevere to the end in their nature and education.
There is no harm in repeating a good thing.
For the interests of rulers require that their subjects should be poor in spirit, and that there should be no strong bond of friendship or society among them, which love, above all other motives, is likely to inspire, as our Athenian tyrants learned by experience; for... [love] had a strength which undid their power...