“There are already scientists-- respected scientists in this country who do experiments on things that most people consider supernatural, such as prayer. When Newton proposed the theory of gravitation it was dismissed as supernaturalism because it was action at a distance. What constitutes supernaturalism in today's science may very well not be supernatural in tomorrow's science.”

Source: Faith vs. Fact (2015), p. 92

What Would You Substitute for the Bible as a Moral Guide? (1900)
Context: All “inspired books,” teaching that what the supernatural commands is right, and right because commanded, and that what the supernatural prohibits is wrong, and wrong because prohibited, are absurdly unphilosophic. And all “inspired books,” teaching that only those who obey the commands of the supernatural are, or can be, truly virtuous, and that unquestioning faith will be rewarded with eternal joy, are grossly immoral. Again I say: Intelligence is the only moral guide.

Source: Why Evolution is True (2009), pp. 224-225

Source: Faith vs. Fact (2015), p. 113

Source: Only Begotten Daughter (1990), Chapter 6 (p. 118)

Source: A Week on the Concord and Merrimack Rivers

Book 1, Chapter 5 “A City of Glowing Shadows” (p. 406)
The Runestaff (1969)

Myth and Reality (1963)
Context: Myth is an extremely complex cultural reality, which can be approached and interpreted from various and complementary viewpoints.
Speaking for myself, the definition that seems least inadequate because most embracing is this: Myth narrates a sacred history; it relates an event that took place in primordial Time, the fabled time of the "beginnings." In other words myth tells how, through the deeds of Supernatural Beings, a reality came into existence, be it the whole of reality, the Cosmos, or only a fragment of reality — an island, a species of plant, a particular kind of human behavior, an institution. Myth, then, is always an account of a "creation"; it relates how something was produced, began to be. Myth tells only of that which really happened, which manifested itself completely. The actors in myths are Supernatural Beings. They are known primarily by what they did in the transcendent times of the "beginnings." hence myths disclose their creative activity and reveal the sacredness (or simply the "supernaturalness") of their works. In short, myths describe the various and sometimes dramatic breakthroughs of the sacred (or the "supernatural") into the World. It is this sudden breakthrough of the sacred that really establishes the World and makes it what it is today. Furthermore, it is as a result of the intervention of Supernatural Beings that man himself is what he is today, a mortal, sexed, and cultural being.

Source: Bridge of Birds