But there is another aspect of the reason, the active reason which has nothing to do with the body, though it is in some manner resident in it during the life of the latter. This it is which enables the passive intellect to become realized. For the external objects as such are insufficient to endow the rational capacity of the individual with actual ideas, any more than a surface can endow the sense of sight with the sensation of color when there is no light. It is the active intellect which develops the human capacity for thinking and makes it active thought. This alone, the active intellect, is the immortal part of man.
This very imperfect sketch of Aristotle's mode of approach to the ever-living problems of God, the universe and man shows us the wide diversity of his method from that with which the Jews of Biblical and Rabbinic tradition were identified. Greek philosophy must have seemed a revelation to them, and we do not wonder that they became such enthusiastic followers of the Stagirite, feeling as they must have done that his method as well as his results were calculated to enrich their intellectual and spiritual life. Hence the current belief of an original Jewish philosophy borrowed or stolen by the Greeks, and still betraying its traces in the Bible and Talmud was more than welcome to the enlightened spirits of the time. And they worked this unhistorical belief to its breaking point in their Biblical exegesis.
Aristotle, however, was not their only master, though they did not know it. Plotinus in Aristotelian disguise contributed not a little to their conception of God and his relation to the universe. The so-called "Theology of Aristotle"25 is a Plotinian work, and its Pantheistic point of view is in reality foreign to Aristotle's dualism. But the middle ages were not aware of the origin of this treatise, and so they attributed it to the Stagirite philosopher and proceeded to harmonize it with the rest of his system as they knew it.
Aristotle's system may be called theistic and dualistic; Plotinus's is pantheistic and monistic. In Aristotle matter is not created by or derived from God, who is external to the universe. Plotinus derives everything from God, who through his powers or activities pervades all. The different gradations of being are static in Aristotle, dynamic in Plotinus. Plotinus assumes an absolute cause, which he calls the One and the Good. This is the highest and is at the top of the scale of
