 action |  Aristotle, General Topics: ethics |  decision theory: causal |  desire |  Hume, David: moral philosophy |  intention |  Kant, Immanuel: account of reason |  metaethics |  moral motivation |  practical reason |  practical reason: and the structure of actions |  reasons for action: internal vs. external |  reasons for action: justification, motivation, explanation |  weakness of will 