Science (episteme) - Division of the sciences according to aims and objects - Demonstration (apodeixis) - The axioms of the sciences - Being or substance (ousia) - Being before aristotle - Being in the categories - The science of being: first philosophy - Being in metaphysics zeta - Nature (physis) - Principles of change - The four causes or explanations (aitiai) - Defense of teleology - Soul (psyche) - Soul as substance, form and actuality - What the student of soul investigates - Perception - Thought - Success (eudaimonia) - The practical science of ethics - The chief and final good for human beings - Virtues of character - Virtues of intellect