The unexamined life is not worth living.

Not I, but the city teaches.

When desire, having rejected reason and overpowered judgment which leads to right, is set in the direction of the pleasure which beauty can inspire, and when again under the influence of its kindred desires it is moved with violent motion towards the beauty of corporeal forms, it acquires a surname from this very violent motion, and is called love.

And the same things look bent and straight when seen in water and out of it, and also both concave and convex, due to the sight's being mislead by the colors, and every sort of confusion of this kind is plainly in our soul. And, then, it is because they take advantage of this affection in our nature that shadow painting, and puppeteering, and many other tricks of the kind fall nothing short of wizardry.

All that we know is nothing can be known.

Improve yourself by other men's writings thus attaining effortlessly what they acquired through great difficulty.

To harm another is to harm oneself