The renewed passion for physical science brought another school of philosophy into prominence--the Arabian.[195] The chief commentaries of this school on Aristotle, as well as many of their original writings, were translated and published before the middle of the sixteenth century. Their interest being directed rather towards the physical and metaphysical writings of the master, than towards the logical, they helped to satisfy and to foster the growing spirit of inquiry, and at the same time to spread abroad a more exact knowledge of the real Aristotle than was to be derived from the Christian commentators, whose philosophy was much less in sympathy with Aristotle's than was imagined. The general trend of the Arabian school in metaphysics was towards a modified Aristotelianism, leavened by the Neoplatonist conception of the essential unity of all being and all thought, particular things and particular ideas being a free outflow from the One, into which they of necessity return again without affecting its fundamental nature. Bruno was familiar with _Avicenna_,[196] _Avempace_,[197] _Avicebron_,[198] _Algazel_,[199] and above all _Averroes_. Avicebron or Avencebrol was the author of the famous _Fons Vitae_, "the Source of Life," which gained a quite undeserved notoriety for its supposed materialism. Bruno did not know it at first hand, but through quotations in the translated Arabian writings,[200] and criticisms in the Scholastics. Accordingly his idea of it is by no means accurate.[201] He knew that Avicebron had spoken of matter as divine, that he had reduced even the "substantial forms" of Aristotle to transitory phases of matter--"the stable, the eternal, progenetrix, mother of all things,"[202] and had shown the logical necessity of assuming a matter, or ground, out of which corporeal nature on the one hand, incorporeal or spiritual on the other, are differentiated.[203] It is clear that this underlying matter was not material in the ordinary sense, but a unity which in itself was neither corporeal nor spiritual, yet in its different aspects was both at once. That is a conception which formed one of the main theses in Bruno's philosophy. Directly or indirectly, he drew from the _Fons Vitae_ the thought of a common something which runs through all differences, which is their basis, and gives them reality, which stands to them in the relation of Aristotle's matter to forms: under the differences of bodily objects there lies one common matter, under the differences of spiritual beings another, and under the differences of these two secondary "matters" lies a primary matter in which both are one. So too the progress of thought is from the most complex, or composite, material bodies,--through the less complex, the spiritual,--to the highest and simplest, the One.[204] Of Algazel's _Makacid_--a resumé of the chief philosophical systems, which were criticised in a second part of the work--a translation was published in 1506. Although an orthodox