The whole of Bruno's philosophy is based on his view of an infinite universe with an infinity of worlds. He conceived the universe as a vast interrelationship throughout space and time, comprehending all phenomena, material and spiritual. Thence he was led to contemplate the parts under the mode of relativity. The conception of the infinity of the universe renders meaningless the ascription to it of motion, but Bruno conceives each of the infinitely numerous worlds to be moving on its course in relation to other worlds, impelled by its own twofold nature as individual and as part of the whole. All estimates of direction, position and weight within the whole must be relative. Moreover, the cosmological system is illumined by the properties of number.
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Dorothea Waley Singer, in Giordano Bruno : His Life and Thought (1950), Ch. 3 : Cosmology and Philosophy of BrunoGiordano Bruno
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In 1584, twenty-five years before Galileo lifted a telescope, Bruno took the Copernican hypothesis to the outrageous new conclusion that the sun is merely one of an infinity of stars, which stretch across boundless and inexhaustible space. It was consummate audacity to proclaim an infinite universe in the teeth of the doctrinal dogfights of the 16th century. It was yet bolder to exult in the de immenso with the bounding wonder of a poet. The prospect of our earth reduced to a turning speck in endless space was terrifying to contemplate. An ecstatic Bruno cried, "My thoughts are stitched to the stars!" and contemplated little else. With an impetuous abandon that his contemporaries found reckless and even dangerous, Bruno proceeded to rethink man's relationship to the universe, to himself, and to God by the unimaginable light of countless stars.
His conclusions were simply unbelievable for a late medieval mind: infinite other worlds, inhabited like our own, spread throughout space; a structure to the universe of suns and clusters of suns circling in grand orbits, but no "center" except in the ground beneath two human feet; the presence of God not atop an empyrean throne past the threshold of the farthest stars, but inhabiting every atom of matter; an eternal span to matter, which can change its form but never be exhausted in any proportion; and finally a logic infinity demanded of him — an innate union of all contraries, by which evil and good, history and the future, localized humanity and an infinite universe inform and express one another...Giordano Bruno
It is then unnecessary to investigate whether there be beyond the heaven Space, Void or Time. For there is a single general space, a single vast immensity which we may freely call Void; in it are innumerable globes like this one on which we live and grow. This space we declare to be infinite, since neither reason, convenience, possibility, sense-perception nor nature assign to it a limit. In it are an infinity of worlds of the same kind as our own.
Giordano Bruno
As God has made the soul immortal, he has made the universe infinite, if it is true that eternity is nothing other than unlimited duration and infinity is space without limits. Suppose the universe were not infinite: God himself would be finite, because he could not be where there is nothing, and he could not increase the size of the universe without adding to his own size and come to be where he had not been before.
Cyrano de Bergerac
I will prove that there are infinite worlds in an infinite world. Imagine the universe as a great animal, and the stars as worlds like other animals inside it. These stars serve in turn as worlds for other organisms, such as ourselves, horses and elephants. We in our turn are worlds for even smaller organisms such as cankers, lice, worms and mites. And they are earths for other, imperceptible beings.
Just as we appear to be a huge world to these little organisms, perhaps our flesh, blood and bodily fluids are nothing more than a connected tissue of little animals that move and cause us to move. Even as they let themselves be led blindly by our will, which serves them as a vehicle, they animate us and combine to produce this action we call life.Cyrano de Bergerac
Through the seventeenth and eighteenth centuries, Bruno's ideas were widely imparted, borrowed, sounded; almost never, though, with the name Giordano Bruno attached to them. Kepler once chided Galileo for omitting his debt to Bruno; yet we can discern Kepler's own indifference... Later generations would evoke Bruno's writings to the phrase, without quoting or acknowledging him. Recent scholarship on Spinoza, for example, cites Bruno's powerful exertion on his thought about infinity and on his style. Never does Spinoza cite Bruno by name.
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