Whoever fights monsters should see to it that in the process he does not become a monster. And when you gaze long into an abyss, the abyss gazes also into you.

He who has a why to live can bear almost any how.

God is dead! God remains dead! And we have killed him!

One must still have chaos in oneself to give birth to a dancing star.

What does not kill me makes me stronger.

You must learn all things: both the steadfast heart of well-rounded Truth and the opinions of mortals, in which there is no true trust.

-- Parmenides

For thinking and Being are the same.

-- Parmenides

Color exists by convention, sweet by convention, bitter by convention; in reality there are only atoms and void.

-- Democritus

I know that I know nothing.

-- Socrates

Imagine prisoners chained underground since childhood, seeing only shadows on a wall and taking them for reality.

-- Plato

All things are ungraspable.

-- Pyrrho