He reached Lyons, which was also at that time a city of refuge against religious persecutions, and he addressed himself to his compatriots, begging for work from the publishers, Aldo and Grifi; but not succeeding in gaining enough to enable him to subsist, after a few days he left, and went on his way to Toulouse, where there was a famous university; and having made acquaintance with several men of intellect, Bruno was invited to lecture on the Sphere, which he did, with various other subjects, for six months, when the chair of Philosophy becoming vacant, he took the degree of Doctor, and competed for it; and he continued for two years in that place, teaching the philosophy of Aristotle and of others. He took for the text of his lectures the treatise of Aristotle, "De Anima," and this gave him the opportunity of introducing and discussing the deepest questions--upon the Origin and Destiny of Humanity; The Soul, is it Matter or Spirit? Potentiality or Reality? Individual or Universal? Mortal or Eternal? Is Man alone gifted with Soul, or are all beings equally so? Bruno's system was in his mind complete and mature; he taught that everything in Nature has a soul, one universal mind, penetrates and moves all things; the world itself is a _sacrum animal_. Nothing is lost, but all transmutes and becomes. This vast field afforded him scope for teaching his doctrines upon the world, on the movement of the earth, and on the universal soul. The novelty and boldness of his opinions roused the animosity of the clergy against him, and after living two years and six months at Toulouse, he felt it wise to retire, and leaving the capital of the Languedoc, he set his face towards Paris.
The two books--the fruit of his lectures--which he published in Toulouse, "De Anima" and "De Clavis Magis," were lost.
The title of Doctor, or as he said himself, "Maestro delle Arti," which Bruno had obtained at Toulouse, gave him the faculty of teaching publicly in Paris, and he says: "I went to Paris, where I set myself to read a most unusual lecture, in order to make myself known and to attract attention." He gave thirty lectures on the thirty Divine attributes, dividing and distributing them according to the method of St. Thomas Aquinas: these lectures excited much attention amongst the scholars of the Sorbonne, who went in crowds to hear him; and he introduced, as usual, his own ideas while apparently teaching the doctrines of St. Thomas. His extraordinary memory and his eloquence caused great astonishment; and the fame of Bruno reached the ears of King Henry III., who sent for him to the Court, and being filled with admiration of his learning, he offered him a substantial subsidy.