Stoicism
Focus only on what you can control; master your reactions.
Existentialism
Life has no built-in meaning; you must create your own.
Virtue Ethics
Goodness comes from building habits of excellence.
Rationalism
Use logic and reason to find truth.
Empiricism
Trust only what you can observe and experience.
Nihilism
Value and meaning are human fictions; nothing objectively matters.
Utilitarianism
The right choice is whatever causes the most happiness for the most people.