The result of the enquiry undertaken leads to the conclusion that human nature, the human soul, and the capabilities and the acts of these two, just like the capabilities of the practical intellect, are all finalized with respect to the perfection of the human intellect. Nature, the soul, and the human intellect are, however, insufficient to attain perfection and it is not possible to leave out of consideration the acts generated by volition and choice which depend on the practical intellect. For this reason, therefore, these acts must also become the object of investigation like all that which constitutes human will. Desire and the things, which depend on sense and discernment—which the other animals also possess—on the other hand, are neither human, nor useful for attaining theoretical perfection. According to this criterion it is necessary to re-examine completely all the scientific fields already established in the search for that which contributes to the attainment of perfection by man and that which, on the other hand, impedes this search. 