 Avicenna’s rationalist empiricism is the main reason why he strove in his philosophy on the one hand to perfect and fine-tune logical method and on the other to study, at an unprecedented level of sophistication and precision, the human (rational) soul and cognitive processes which provide knowledge through the application of rational empirical methods. In section after section and chapter after chapter in numerous works he analyzes not only questions of formal logic but also the mechanics through which the rational soul acquires knowledge, and in particular the conditions operative in the process of hitting upon the middle term: how one can work for it and where to look for it, and what the apparatus and operations of the soul are that bring it about (Gutas 2001). This entailed detailed study of the operations of the soul in its totality and in all its functions, whether rational, animal, or vegetative. He charts in great detail the operations of all the senses, both the five external senses and especially the five internal senses located in the brain—common sense, imagery (where the forms of things are stored), imagination, estimation (judging the imperceptible significance or connotations for us of sensed objects, like friendship and enmity, which also includes instinctive sensing), and memory—and how they can help or hinder the intellect in hitting upon the middle term and perceiving intelligibles more generally. When, at the end of all these operations just described, the intellect hits upon a middle term or just perceives an intelligible that it had not been thinking about before, it acquires the intelligible in question (hence the appellation of this stage of intellection, “acquired intellect,” al-ʿaql al-mustafād ), or, otherwise expressed, acquires it from the active intellect which thinks it eternally and atemporally since the active intellect is, in effect, the locus of all intelligibles, there being no other place for them to be always in actual existence. The human intellect can think an intelligible for some time, but then it disappears, it being impossible for the immaterial intellect to “store” it, or have memory of it, as opposed to the two internal senses, imagery and memory, which have a storage function for their particular oblects (forms and connotational attributes) because they have a material base in the brain. Avicenna calls this process of acquisition or apprehension of the intelligibles a “contact” (ittiṣāl) between the human and active   intellects.[7]   In the emanative language which he inherited from the Neoplatonic tradition, and which he incorporated in his own understanding of the cosmology of the concentric spheres of the universe with their intercommunicating intellects and souls, he referred to the flow of knowledge from the supernal world to the human intellect as “divine effluence” (al-fayḍ al-ilāhī). The reason that this is possible at all is again the consubstantiality and congeneric nature of all intellects, human and celestial alike. Only, as already mentioned, because of their varied circumstances, the latter think of the intelligibles directly, permanently, and atemporally, while the human intellect has to advance from potentiality to actuality in time by technical means leading to the discovery of the middle term as it is assisted by all the other faculties of the soul and body. 