   While Razi constructed his psychology with eclectic borrowings from Plato, Galen and Aristotle, he is reported to have gone further afield in metaphysics. He believed there were five eternal cosmic principles, one of which was a world soul that needed divine intervention to liberate it from the seductive and defiling matter of the  world.[11] This is similar to the message he presents in Al-Tibb al-Ruhânî, that the immortal rational soul of an individual must strive to free itself from corporeal entanglements, lest it be reincarnated in another, not necessarily human, body.