 There is thus a deeply ethical aspect to Avicenna’s philosophical system. The core conception was the life of the rational soul: because our theoretical intellects—our selves—are consubstantial with the celestial intellects, it is our cosmic duty to enable our intellects to reach their full potential and behave like the celestial ones, that is, think the intelligibles (cf. Lizzini 2009). And because we (i.e. our essential core which identifies us and survives, our rational souls) are given a body and our materiality hampers our unencumbered intellection like that enjoyed by the First and the other celestial beings, we have to tend to the body by all means, behavioral (religious practices, ethical conduct) and pharmacological, to bring its humoral temperament to a level of equilibrium that will help the function of the intellect in this life and prepare it for unimpeded and continuous intellection, like that of the deity, in the next. This is humanist ethics dictated by a scientific view of the world.