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

What does not kill me makes me stronger.

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.

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

There are no facts, only interpretations.

Endure and renounce.

-- Epictetus

Fire tests gold; adversity tests strong people.

-- Seneca

Bodily pain does not last without limit; intense pain is brief in duration.

-- Epicurus

If you carve without ceasing, even metal and stone can be engraved.

-- Xunzi

Energy and persistence conquer all things.

-- Benjamin Franklin

I'm convinced that about half of what separates successful entrepreneurs from unsuccessful ones is pure perseverance.

-- Steve Jobs