 According to Kilwardby, the human soul is a composite of three forms (potentiae): vegetative, sensitive, and intellective. The vegetative and sensitive are qualified as the principles of life because through them the being performs the operations of life. Like most of his contemporaries, Kilwardby claims a double origin for the parts of the human soul: the vegetative and sensitive result from natural generation, that is, they are educed from the active potentiality of matter, whereas the intellective soul is created directly by God. It is created as the perfection of the human body and as a hoc aliquid (E 5; QLIIS 138, 370), that is, an individual in the genus of substance. The intellective soul is a spiritual substance of the rational kind, but is not a person because it is part of another thing—a human being (QLIII1S 8, 36). The soul constitutes a person only when united with the body in an actual existing human being (QLIII1S 10, 52). A human being is constituted by the rational soul and the body (E 7, 51).