Metaphysics discusses topics including substance, accident, causation and God. The text was lost in Western Europe during the Dark Ages.

Categories is the first of Aristotle's six texts on logic which are collectively known as the Organon. In Categories Aristotle enumerates all the possible kinds of things that can be the subject or the predicate of a proposition. Aristotle places every object of human apprehension under one of ten categories . Aristotle intended them to enumerate everything that can be expressed without composition or structure, thus anything that can be either the subject or the predicate of a proposition. The ten categories, or classes, are: Substance, Quantity, Quality, Relation, Place, Time, Position, State, Action and Affection.

Magna Moralia discusses topics including friendship, virtue, happiness and God. It is disputed whether Aristotle wrote Magna Moralia. This author concludes that it is absurd to suggest that God contemplates only God but does not propose an alternative activity for God.