Cited in: Carol A. Dingle (2000) Memorable Quotations: Philosophers of Western Civilization. p. 21
“Copernicus never discusses matters of religion or faith, nor does he use argument that depend in any way upon the authority of sacred writings which he might have interpreted erroneously. … He did not ignore the Bible, but he knew very well that if his doctrine were proved, then it could not contradict the Scriptures when they were rightly understood.”
Letter to the Grand Duchess Christina (1615)
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Galileo Galilei 70
Italian mathematician, physicist, philosopher and astronomer 1564–1642Related quotes
Source: The Path to Home (1919), p.130 - Lost Opportunities, stanzas 2 and 3.
Muhammad Kulayni, Usūl al-Kāfī, vol.2, p. 234
                                        
                                        On William Makepeace Thackeray Ch. II: The Great Victorian Novelists (p. 65) 
The Victorian Age in Literature (1913)
                                    
                                        
                                        Lieutenant-General Hon. C. Grey, Some Account of the Life and Opinions of Charles, Second Earl Grey (London: Richard Bentley, 1861), pp. 10-11. 
1830s
                                    
                                        
                                        "On Freedom" in All Life is Problem Solving (1999) 
Context: When I speak of reason or rationalism, all I mean is the conviction that we can learn through criticism of our mistakes and errors, especially through criticism by others, and eventually also through self-criticism. A rationalist is simply someone for whom it is more important to learn than to be proved right; someone who is willing to learn from others — not by simply taking over another's opinions, but by gladly allowing others to criticize his ideas and by gladly criticizing the ideas of others. The emphasis here is on the idea of criticism or, to be more precise, critical discussion. The genuine rationalist does not think that he or anyone else is in possession of the truth; nor does he think that mere criticism as such helps us achieve new ideas. But he does think that, in the sphere of ideas, only critical discussion can help us sort the wheat from the chaff. He is well aware that acceptance or rejection of an idea is never a purely rational matter; but he thinks that only critical discussion can give us the maturity to see an idea from more and more sides and to make a correct judgement of it.