Bruno was a mathematician and philosopher, but is not considered an astronomer by the modern astronomical community, as there is no record of him carrying out physical observations, as was the case with Brahe, Kepler, and Galileo. Pogge, Richard W. http://www.astronomy.ohio-state.edu/~pogge/Essays/Bruno.html （頁面存檔備份，存於網際網路檔案館） 1999.
Birx, Jams H.. "Giordano Bruno （頁面存檔備份，存於網際網路檔案館）". The Harbinger, Mobile, AL, 11 November 1997. "Bruno was burned to death at the stake for his pantheistic stance and cosmic perspective."
Gatti, Hilary (2002). Giordano Bruno and Renaissance Science: Broken Lives and Organizational Power. Ithaca, New York: Cornell University Press. pp. 18–19. Retrieved 21 March 2014. For Bruno was claiming for the philosopher a principle of free thought and inquiry which implied an entirely new concept of authority: that of the individual intellect in its serious and continuing pursuit of an autonomous inquiry… It is impossible to understand the issue involved and to evaluate justly the stand made by Bruno with his life without appreciating the question of free thought and liberty of expression. His insistence on placing this issue at the center of both his work and of his defense is why Bruno remains so much a figure of the modern world. If there is, as many have argued, an intrinsic link between science and liberty of inquiry, then Bruno was among those who guaranteed the future of the newly emerging sciences, as well as claiming in wider terms a general principle of free thought and expression.
Montano, Aniello (24 November 2007). Antonio Gargano, ed. Le deposizioni davanti al tribunale dell'Inquisizione. Napoli: La Città del Sole. p. 71. In Rome, Bruno was imprisoned for seven years and subjected to a difficult trial that analyzed, minutely, all his philosophical ideas. Bruno, who in Venice had been willing to recant some theses, become increasingly resolute and declared on 21 December 1599 that he 'did not wish to repent of having too little to repent, and in fact did not know what to repent.' Declared an unrepentant heretic and excommunicated, he was burned alive in the Campo dei Fiori in Rome on 17 February 1600. On the stake, along with Bruno, burned the hopes of many, including philosophers and scientists of good faith like Galileo, who thought they could reconcile religious faith and scientific research, while belonging to an ecclesiastical organization declaring itself to be the custodian of absolute truth and maintaining a cultural militancy requiring continual commitment and suspicion.
Birx, James (11 November 1997). "Giordano Bruno". Mobile Alabama Harbinger. Retrieved 28 April 2014. To me, Bruno is the supreme martyr for both free thought and critical inquiry… Bruno's critical writings, which pointed out the hypocrisy and bigotry within the Church, along with his tempestuous personality and undisciplined behavior, easily made him a victim of the religious and philosophical intolerance of the 16th century. Bruno was excommunicated by the Catholic, Lutheran and Calvinist Churches for his heretical beliefs. The Catholic hierarchy found him guilty of infidelity and many errors, as well as serious crimes of heresy… Bruno was burned to death at the stake for his pantheistic stance and cosmic perspective.
Bertrand Russell, A History of Western Philosophy,. Bruno is one of those heroic figures who have fought for intellectual freedom against the tyranny of authority. His philosophy is interesting as an example of the transition from medieval to modern ways of thinking.
Michael J. Crowe, The Extraterrestrial Life Debate 1750–1900, Cambridge University Press, 1986, p. 10, "[Bruno's] sources... seem to have been more numerous than his followers, at least until the eighteenth- and nineteenth-century revival of interest in Bruno as a supposed 'martyr for science.' It is true that he was burned at the stake in Rome in 1600, but the church authorities guilty of this action were almost certainly more distressed at his denial of Christ's divinity and alleged diabolism than at his cosmological doctrines."
Adam Frank, The Constant Fire: Beyond the Science vs. Religion Debate, University of California Press, 2009, p. 24, "Though Bruno may have been a brilliant thinker whose work stands as a bridge between ancient and modern thought, his persecution cannot be seen solely in light of the war between science and religion."
White, Michael. The Pope and the Heretic: The True Story of Giordano Bruno, the Man who Dared to Defy the Roman Inquisition, p. 7. Perennial, New York, 2002. "This was perhaps the most dangerous notion of all... If other worlds existed with intelligent beings living there, did they too have their visitations? The idea was quite unthinkable."
Shackelford, Joel (2009). "Myth 7 That Giordano Bruno was the first martyr of modern science". In Numbers, Ronald L. Galileo goes to jail and other myths about science and religion. Cambridge, Mass: Havard University Press. p. 66. "Yet the fact remains that cosmological matters, notably the plurality of worlds, were an identifiable concern all along and appear in the summary document: Bruno was repeatedly questioned on these matters, and he apparently refused to recant them at the end.14 So, Bruno probably was burned alive for resolutely maintaining a series of heresies, among which his teaching of the plurality of worlds was prominent but by no means singular."
Knox, Dilwyn, "Giordano Bruno", The Stanford Encyclopedia of Philosophy (Summer 2019 Edition), Edward N. Zalta (ed.), URL=<https://plato.stanford.edu/archives/sum2019/entries/bruno/ （頁面存檔備份，存於網際網路檔案館）>. quote= 「For many Italians, his philosophy, heroic defiance of ecclesiastical authority and execution exemplified the long struggle to free philosophy from the trammels of revealed religion.」
Albert Einstein:Religion and Science. Sacred-texts.com. [2013-06-16]. （原始內容存檔於2017-07-03）. 「 Religion, on the other hand, deals only with evaluations of human thought and action: it cannot justifiably speak of facts and relationships between facts. According to this interpretation the well-known conflicts between religion and science in the past must all be ascribed to a misapprehension of the situation which has been described.」「 a conflict arises when a religious community insists on the absolute truthfulness of all statements recorded in the Bible.」「this is where the struggle of the Church against the doctrines of Galileo and Darwin belongs.」「The main source of the present-day conflicts between the spheres of religion and of science lies in this concept of a personal God.」
Cause, Principle and Unity, by Giordano Bruno. Edited by R.J. Blackwell and Robert de Lucca, with an Introduction by Alfonso Ingegno. Cambridge University Press, 1998, p. 63.
Hegel's lectures on the history of philosophy, translated by E.S. Haldane and F.H. Simson, in three volumes. Volume III, p. 119. The Humanities Press, 1974, New York.
Cause, Principle and Unity, by Giordano Bruno. Edited by R.J. Blackwell and Robert de Lucca, with an Introduction by Alfonso Ingegno. p.x. Cambridge University Press, 1998.
White, Michael. The Pope and the Heretic: The True Story of Giordano Bruno, the Man who Dared to Defy the Roman Inquisition, p. 7. Perennial, New York, 2002.
"Summary of the trial against Giordano Bruno: Rome, 1597". Vatican Secret Archives. Archived from the original on 9 June 2010. Retrieved 18 September 2010.
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