Friedrich Nietzsche

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

Existentialism

"That which does not kill us makes us stronger."

Ethics

"There are no facts, only interpretations."

Epistemology

"Without music, life would be a mistake."

Aesthetics

"God is dead. God remains dead. And we have killed him."

A proclamation about the decline of religious belief in the modern world.

Metaphysics