[Footnote 1: Nicolaus Copernicus (Koppernik; 1473-1543) was born at Thorn; studied astronomy, law, and medicine at Cracow, Bologna, and Padua; and died a Canon of Frauenberg. His treatise, _De Revolutionibus Orbium Caelestium_, which was dedicated to Pope Paul III., appeared at Nuremberg in 1543, with a preface added to it by the preacher, Andreas Osiander, which calls the heliocentric system merely an hypothesis advanced as a basis for astronomical calculations. Copernicus reached his theory rather by speculation than by observation; its first suggestion came from the Pythagorean doctrine of the motion of the earth. On Copernicus cf. Leop. Prowe, vol. i. _Copernicus Leben_, vol. ii. (_Urkunden_), Berlin, 1883-84; and K. Lohmeyer in Sybel's _Historische Zeitschrift_, vol. lvii., 1887.] [Footnote 2: Cf. on Bruno, H. Brunnhofer (somewhat too enthusiastic), Leipsic, 1882; also Sigwart, _Kleine Schriften_, vol. i. p. 49 _seq_.] Bruno completes the Copernican picture of the world by doing away with the motionless circle of fixed stars with which Copernicus, and even Kepler, had thought our solar system surrounded, and by opening up the view into the immeasurability of the world. With this the Aristotelian antithesis of the terrestrial and the celestial is destroyed. The infinite space (filled with the aether) is traversed by numberless bodies, no one of which constitutes the center of the world. The fixed stars are suns, and, like our own, surrounded by planets. The stars are formed of the same materials as the earth, and are moved by their own souls or forms, each a living being, each also the residence of infinitely numerous living beings of various degrees of perfection, in whose ranks man by no means takes the first place. All organisms are composed of minute elements, called _minima_ or monads; each monad is a mirror of the All; each at once corporeal and soul-like, matter and form, each eternal; their combinations alone being in constant change. The universe is boundless in time, as in space; development never ceases, for the fullness of forms which slumber in the womb of matter is inexhaustible. The Absolute is the primal unity, exalted above all antitheses, from which all created being is unfolded and in which it remains included. All is one, all is out of God and in God. In the living unity of the universe, also, the two sides, the spiritual (world-soul), and the corporeal (universal matter), are distinguishable, but not separate. The world-reason pervades in its omnipresence the greatest and the smallest, but in varying degrees. It weaves all into one great system, so that if we consider the whole, the conflicts and contradictions which rule in particulars disappear, resolved into the most perfect harmony. Whoever thus regards the world, becomes filled with reverence for the Infinite and bends his will to the divine law--from true science proceed true religion and true morality, those of the spiritual hero, of the heroic sage.