Source: Hallucinogens and the Shamanic Origins of Religion (1972), p. 264
“He must be a man of little faith, who would fear to subject his own religion to the same critical tests to which the historian subjects all other religions. We need not surely crave a tender or merciful treatment for that faith which we hold to be the only true one.”
Preface (Scribner edition, 1872) <!-- New York, Scribner p xx -->
Chips from a German Workshop (1866)
Context: He must be a man of little faith, who would fear to subject his own religion to the same critical tests to which the historian subjects all other religions. We need not surely crave a tender or merciful treatment for that faith which we hold to be the only true one. We should rather challenge it for the severest tests and trials, as the sailor would for the good ship to which he trusts his own life, and the lives of those who are dear to him. In the Science of Religion, we can decline no comparisons, nor claim any immunities for Christianity, as little as the missionary can, when wrestling with the subtle Brahmin, or the fanatical Mussulman, or the plain speaking Zulu.
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Max Müller 25
German-born philologist and orientalist 1823–1900Related quotes

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Context: The gods we stand by are the gods we need and can use, the gods whose demands on us are reinforcements of our demands on ourselves and on one another. What I then propose to do is, briefly stated, to test saintliness by common sense, to use human standards to help us decide how far the religious life commends itself as an ideal kind of human activity. … It is but the elimination of the humanly unfit, and the survival of the humanly fittest, applied to religious beliefs; and if we look at history candidly and without prejudice, we have to admit that no religion has ever in the long run established or proved itself in any other way. Religions have approved themselves; they have ministered to sundry vital needs which they found reigning. When they violated other needs too strongly, or when other faiths came which served the same needs better, the first religions were supplanted.

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Source: No God But God: The Origins, Evolution and Future of Islam

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Religion within the Limits of Reason Alone (1793)