The Renaissance was one of the most groundbreaking periods in history, as it saw the revival of classical thinking, yet it also paved the way for future ideas. The time was ripe with ideas; philosophers, artists, and scientists began to break away from religion and propose new ideas, which were scientific in nature, and did not rely on the Church’s dogma. Unfortunately, countless intellectuals from the period were persecuted by the Church, which denounced them as heretics, burning their books, trying as hard as possible to stunt the growth of scientific thought. Among these thinkers was the legendary Giordano Bruno: philosopher, cosmologist, and occult mage.
Born in 1548 to a poor family in Nola, Italy, Bruno at a young age joined the Dominican Order, which was the common thing to do in his time. Eager to learn, Bruno saw the Order as a great means through which to get an education, seeing as he could not afford a formal one. It did not take long for a young Bruno to take a disliking to Catholicism, for early on he stripped his cell of everything but the cross. Later on, he was accused of heresy, and in 1576, he was exiled from the Order, destined to a life of itinerancy, wandering from one place to another for refuge from an institution which, at the time, seemed to be everywhere, inescapable. During his time at the Order, Bruno studied the great thinkers that had come before him: Lull, Plotinus, Aquinas, Pythagoras, Parmenides, Cusa, and Copernicus, the latter of whom would imprint himself on Bruno’s thought most saliently. Bruno’s exile took him all across Europe, from Switzerland to France to England and thence to Germany. To afford his non-stop traveling, Bruno worked as both a public lecturer and private tutor. Geneva, he found, provided no safety for him, so upon receiving a letter from Henry III, King of France, who insisted he come, Bruno absquatulated to France, where he was welcomed to the court. There he taught the King and enjoyed tranquility for some time. He also lectured at a number of eminent colleges, such as the University of Paris, Oxford, and Wittenberg. Bruno came into contact with many Protestants who were also hiding from the Church, although he came to dislike them, for they were, according to him, narrow-minded; likewise, the Protestants did not consider themselves sympathetic to philosophers like Bruno. Throughout his wandering, Bruno never really enjoyed any belonging, nor any peace. Unwanted, homeless, an outcast, Bruno had no place to call home—which is why he was delighted to get a letter from Giovanni Mocenigo on May 23, 1592, who was from his native Italy, whereupon Bruno quickly went to Venice, which was still heavily Catholic. Bruno was aware of the apparent danger posed by his returning to Italy, but he took Mocenigo’s amiable invitation as a sign that he was in good terms, that it was safe to come back. Mocenigo was fascinated by Bruno’s work in mnemonics. Bruno took this opportunity to also get a position at the University of Padua, at which he lectured for his stay. Unbeknownst to the philosopher, Mocenigo was convinced Bruno was actually an Occult mage trained in black magic. When he was unsatisfied with his learning, upset that Bruno was apparently holding out on teaching him the dark arts, feeling betrayed, Mocenigo secretly alerted the Venice Inquisition. Locked in Mocenigo’s basement, Bruno was then taken to the Inquisition. He was tortured and forced to recant all his heretic beliefs. Bruno was pardoned, but soon the court at Rome requested his hearing. For eight years Bruno sat rotting in the prisons of Rome. The Inquisition at Rome was not as lenient as the Venetian, and much more austere. Whereas the latter let him off the hook and took pity on him, the former would listen to nothing he said. On February 17, 1600, at the Campo de’ Fiori, Giordano Bruno, after spending his whole life in exile, after spending eight years in prison, was burned alive.
Bruno had an unorthodox education, having read, in addition to the classic philosophers, Egyptian mystical works and Hermetic writings. He read the Hermetic Corpus, a mystical work written by a supposed Hermes Trismegistus, a prophet of Egyptian religion. From his readings in Hermeticism he derived the ideas of metempsychosis (from Orphism), or transmigration of the soul, and pantheism, from which he came to the conclusion, “God in all things.” Another important belief he got was that movement was equivalent to energy. Where there was energy, there was movement, and vice versa. Before the 19th-century, scholars and historians, based on superficial reading, considered Bruno to be a deist and magician; both conceptions have still carried on today and hang over his name, but have mostly been rejected through serious reading. He read Aristotle, whom he thought pedantic and dry; Copernicus, whose cosmological theory impacted Bruno; Lucretius’ De Rerum Natura, from which he borrowed the doctrine of infinite world; and Nicholas of Cusa, who provided for Bruno theological inspiration.
The Art of Memory and On the Shadows of Ideas were published in 1582. These two works were written by Bruno on mnemonics and were considered to be alchemical and occult in nature. With seemingly divine inspiration, Bruno devised secret techniques to memorize things, allowing him, it is said, to visualize and draw out a mental map of the entire cosmos in his head. The art of memory, as he put it, was reserved for mystics and was conceived of as obscure, a practice only for those trained in it, people like Paracelsus. This is the main reason many compared him to a mage-like figure, as the art of mnemonics was comparable to magic. Bruno ascribed to the cosmos a system of relativism, asserting that there was no “center of the Universe.” Despite increasing infinitely, the Universe had no center; center, for Bruno, was relative to where a spectator was standing. At any point in the Universe a person could say he is at the center. Just as there is no fixed center, there is no absolute motion or time. Motion, it is important to remember, requires a reference point. An object is in motion insofar as it is moving in relation to an object, meaning that motion is relative. Similarly, time is not some absolute unit of measurement, but is rather used to measure something in reference to something else, usually motion. Epicurus, interestingly, offered a similar view: “As for unbounded space, we should not predicate ‘above’ or ‘below’ of any parts of it in the sense of a highest or lowest point. We can refer to what is over our heads relative to where we stand.” Further, Aristotle was wrong about absolute weight, Bruno said. There is no intrinsic heaviness or lightness of a planet, as Aristotle said; rather, every planet’s weight was to be determined respective to itself. Bruno was a champion of Heliocentrism, the belief that the Earth revolved around the Sun, and not the other way around. This theory was first propounded by Aristarchus of Samos, but was taken up most memorably by Copernicus, who revolutionized it. The Roman astronomer Ptolemy wrote that the Earth was the body around which the Sun revolved, and it stuck, ultimately being taken up by the Church, which it held to be factual. Thus, Bruno made himself a target to the Church, but he would be proven right centuries later. He claimed, albeit incorrectly, that all planetary bodies had a circular course. Aristotle posed the question of a Prime Mover, taken by some to be an argument for God, to account for the motion of the Celestial bodies: If causation is based on some prior cause, what was the first cause that started it all? According to Aristotle, some kind of Supreme being must have caused the first thing in the Universe, giving way to the rest of the Universe. Bruno, however, disagreed with this notion, relying instead on his Hermeticism and Hylozoism—the belief that matter is alive, which he borrowed from Aristotle, incidentally—to explain that the planets had their own intrinsic movement. Bruno thought energy and movement were related, so he stated that the planets moved by themselves, as though they had their own impetus. There is no need for a Prime Mover in Bruno’s world because the planets move themselves. Most famously, Bruno supported the idea that there is a plurality of worlds out there in space. His magnum opuses On the Infinite Universe and Worlds (1591) and On the Immeasurable and Countless Worlds outline his theory in detail. In them Bruno argues that if the Universe is infinite and always growing, there must be infinite planets and habitable Earths like ours. He also said that Copernicus could only make out eight planets in the solar system; but if the senses are limited in their capacities, Bruno argued, that would mean they could not grasp the possibly unlimited planets beyond us. Some mistakenly attribute to Bruno the creation of this theory; however, Epicurus again sets the precedent: “And the number of worlds is infinite, some worlds being similar to this one, while other worlds are very different.” Medieval scholars believed the Heavenly bodies were composed of the fifth element, Æther, which they borrowed from Aristotle. Bruno thought otherwise: He maintained they there composed of the four classical elements; there was no need for the unbounded Æther. This placed him at odds, once more, with the Church, considering this conception completely opposed Genesis. The central idea in Bruno’s philosophy is God. Combining Neoplatonism with Egyptian mysticism, Bruno’s pantheism declared God to be causa immanens, or immanent cause; in other words, God is self-caused, independent of any external causation. God exists in essence of himself. As though anticipating Leibniz, Bruno produced a theory of monadology, basically saying that reality is composed of infinite, self-contained entities called monads. God was, of course, the monas monadum—the highest monad. From this vision of God, Bruno deduced that all substance—that is to say, matter—is One, i.e., all matter is derived from the being of God; matter and God are one and the same. Particulars (circonstanzie) are explained as being specific manifestations of substance. To use an example to clarify: A chair is made of substance, substance being permeated by God, and chairs may come in many shapes and sizes, many particulars, in other words, of the one substance that is chair. Another statement Bruno makes is that God is the Universe, and the Universe God. The Universe has always existed and shall always continue to exist. There was no creation of the Universe; it did not just go poof! and appear, as it did in the Big Bang. Here, one can see the blatant influence of Parmenides. God is eternal, having no beginning, nor end; He simply has been and will be.
Moments before his auto-da-fé, Bruno was offered the cross, to which he replied, “Perhaps you, my judges, pronounce this sentence against me with greater fear than I receive it.” These fearless words uttered from a man who was about to die carry immense heroism. Here, a man who stood up against the Church, his fate in their hands, as he says these words. What he meant by saying this was that he, Bruno, was dying for a greater cause. He devoted his life to and died in the name of Truth, knowing that while he was but a mortal man, transient in nature, Truth was undying and eternal, an ideal he fought for till the end. The Church, on the other hand, was stubborn and eschewed Truth. They say you can kill a man, but you can’t kill an idea—Bruno’s judges knew this. By killing Bruno in an attempt to cover up the Truth, they were not making things better, but rather released something greater and beyond their control. While he is not remembered today despite his ingenious thought regarding the cosmos, Bruno remains a martyr for science, belonging up there with Galileo. In the words of John Addington Symonds, “Bruno was a hero in the battle for freedom of the conscience, for the right of man to think and speak in liberty.”
 He despised Oxford and its professors, describing them as pedantic; he got into a quarrel over an accusation of plagiarism.
 Edwards, The Encyclopedia of Philosophy, Vol. 1, p. 406
 Epicurus, Letters and Sayings of Epicurus, “Letter to Herodotus,” p. 13
 Id., p. 6
 Hecht, Doubt: A History, p. 295
 Symonds, Renaissance in Italy, Vol. 2, p. 799
For further reading: An Intellectual and Cultural History of the Western World Vol. 2 by Harry Elmer Barnes (1965)
Renaissance in Italy Vol. 2 by John Addington Symonds (1935)
The Encyclopedia of Philosophy Vol. 1 by Paul Edwards (1967)
Doubt: A History by Jennifer Michael Hecht (2003)
The Idea of Nature by R.G. Collingwood (1960)
History of Philosophy by Julian Marías (1967)