• What is wrong with giving an account of things through an example?
• What is the distinction between a form and a quality of a thing?

Phaedo

• Why does the virtuous person not fear death?
• What are the arguments for the immortality of the soul?
• What is recollection?
• Why can the soul not be a harmony?

Categories

• What is the difference between being in a subject and being said of a subject?
• What is a substance?

Physics

• What is it to have a nature?
• What are the four causes?
• What is the difference between luck and chance?
• Why do things change by moving toward an end?

Metaphysics

• What is the relation between experience, craft and wisdom?
• What are the criticisms of the Platonic forms?
• What is the essence of a substance?
• What role does agency play in coming-to-be
• Why is substance not the universal?

Confessions

• What problem is there with the notion of creation?
• What problem is there with the notions of past, present, and future?
• How can we measure time?

Proslogion

• Why must something than which no greater can be thought exist?
• Why may an island than which no greater can be thought not exist?
• How do the properties of God follow from God's being something than which no greater can be thought?

Summa Theologica

• Why is theology superior to the other sciences?
• What is the relation between theology and revelation?
• What is wrong with Anselm's argument for God's existence?
• What are the five proofs for the existence of God?
• What is the problem of evil, and how is it dealt with?

Meditations on First Philosophy

• What is the method of doubt, and what is it supposed to achieve?
• Why may one doubt one's opinions about general objects?
• Why may one not doubt one's own existence?
• Why is the "I" a thinking thing?
• What is the role of clear and distinct perception?
• What is the source of human error?
• Where does the idea of God come from?
• How do we know that bodies exist?
• Why is mind separate from body?

An Enquiry Concerning Human Understanding

• What is the origin of ideas?
• What is the difference between relations of ideas and matters of fact
• What is the basis of causal reasoning?
• What is the nature of belief?
• Why are we ignorant of necessary connections among matters of fact?
• Why might we doubt the existence of independent objects?

Critique of Pure Reason

• What is the "Copernican revolution" in metaphysics?
• What is the difference between appearances and things in themselves?
• What is a synthetic a priori cognition?
• What is space?
• What is the difference between human intuition and God's intuition?
• What is a category of the understanding?

"The Fixation of Belief"

• What are the ways in which doubt can be satisfied?
• What is wrong with the different ways?
• Why is the method of science the best method to satisfy doubt?

"How to Make Our Ideas Clear"

• What is the best way to achieve clarity in our conceptions?

The Problems of Philosophy

• What is the problem of perceptual relativity?
• Do sense-data provide good evidence of the existence of public objects?
• How can we know that physical space exists?
• What is Berkeley's argument for idealism?
• What is the difference between knowledge by acquaintance and knowledge by description?

Apology

• Why can Socrates not be harmed by the judgment of the jury?

Crito

• Why does the opinion of the majority not motivate Socrates's action?
• Why does Socrates's relation to the laws of Athens compel him not to escape?

Republic

• Why is justice not what is to the advantage of the stronger?
• Why is acting justly advantageous?

Nicomachean Ethics

• Why must there be a highest good?
• What is happiness?
• What are the virtues of character?
• Why is virtue of character to be found in the mean?
• Why must virtue be acquired by habit?
• What are the intellectual virtues?
• What is the relation between virtue and pleasure?

"Letter to Menoeceus" and "The Principle Doctrines"

• What is the nature of human happiness?
• What is the highest pleasure, and why is it highest?

"Encheiridion"

• What is the source of human misery?
• What is the most appropriate way to behave?

Leviathan

• What is the basis of all human action?
• What is the state of nature?
• What is the right of nature?
• What is the nature of justice?
• What is the basis of the commonwealth?

Grounding for the Metaphysics of Morals

• What is the relation between morality and happiness?
• What is the basis of moral worth?
• What is the categorical imperative?
• How should other rational beings be treated?
• What is an absolutely good will?

Utilitarianism

• What is wrong with a priori ethics?
• What is the greatest happiness principle?
• How is happiness possible?
• Why are some forms of happiness better than others?
• Why would people follow the greatest happiness principle?
• What is the basis of the greatest happiness principle?

Twilight of the Idols

• Why have the "wisest sages" had a negative attitude toward life?
• Why are reason, happiness, and virtue not the same?
• What is healthy morality?
• How have philosophers erred in causal reasoning?

"The Humanism of Existentialism"

• What is existentialism?
• Why is existentialism optimistic?
• What is anguish, and why is it important?
• What is the basis of human decisions?
• Why is existentialism a humanism?