One of the mediæval writers Bruno associated so closely with himself, that his indebtedness might easily be exaggerated: this was Raymond Lully, whose grim figure stands out from the shadowy thirteenth century,--the author of the celebrated _Art of Reasoning_.[217] The object of the Art was to tabulate the primary forms or elements of thought, and their modes of combination, from which data, it was believed, any process of reasoning, however complex, might be carried out, without greater expenditure of energy than in performing an arithmetical operation with any of the first nine numbers. There was no question of a possible divorce between thought and reality. The result of any such process of rational calculus properly carried out was truth. Bruno thought with Lully that the ultimate ideas within reach of human thought were at the same time substantial elements in reality and that the completest knowledge of reality--short of the Absolute--was within the power of human reason to achieve. Lully included in this rational sphere the dogmas of Christian theology: faith was for the many, who must be _driven_ to believe; reason for the few, the wise. Lully's method attracted, and his teaching influenced nearly all the greater minds of the later middle ages, and of the Renaissance. They became a source of as bitter contention as the doctrines of Aristotle himself. Bruno speaks of Lully as "almost divine"; Agrippa, after being an ardent follower, came to see the vanity of the system, and Bacon called it a method of imposture. At different times Bruno expounded, criticised, and expanded the Art. He claims[218] to have "embellished the method of him whom the best leaders among philosophers admire, follow, imitate." Duns Scotus ("Scotigena"), Nicholas of Cusa, Paracelsus, Agrippa, are named, unjustly, as having drawn their chief doctrines from this source: Lefevre and Bouillé[219] cited among his most recent followers. The art was taught "by some divine genius to a rude uncultured hermit, and although it seems to issue from one too dense and stupid, yet it excels the teaching of any famous Attic orator in this kind, as a crop of wheat excels one of barley. It seemed to us unfitting that this work, struggling upwards to the light, against the envy of oppressing darkness, should be suffered to perish and be lost."[220] Yet Bruno by no means thought Lully's exposition perfect. Of his own Lullian work, the _De Compendiosa Architectura_,[221] he says that it "suffices for the understanding, estimating, and prosecuting of the art of Lully, by those who are skilled in the vulgar philosophy. For in it is expressed in one whole, all that is in Lully's many 'Arts,' in which he always seems to be saying the same thing; you have there all that is in the _Ars Brevis_, the _Ars Magna_, and other books bearing the name of _Arbor Scientiae_, _Inventionis_, _Artes demonstrativae_, _mixtionis principiorum_, _Auditus cabalistici_, or