Books
"Meditations" by Marcus Aurelius
"The Nicomachean Ethics" by Aristotle
"The Social Contract" by Jean-Jacques Rousseau
"Thus Spoke Zarathustra" by Friedrich Nietzsche
"The Phenomenology of Spirit" by Georg Wilhelm Friedrich Hegel
"Critique of Pure Reason" by Immanuel Kant
"The Gay Science" by Friedrich Nietzsche
"The Birth of Tragedy" by Friedrich Nietzsche.