“In those parts of the world where learning and science has prevailed, miracles have ceased; but in such parts of it as are barbarous and ignorant, miracles are still in vogue; which is of itself a strong presumption that in the infancy of letters, learning and science, or in the world's non-age, those who confided in miracles, as a proof of the divine mission of the first promulgators of revelation, were imposed upon by fictitious appearances instead of miracles.”

Legislative Assembly, February 9, 1865
Context: Miracles would cease to be miracles if they were events of everyday occurrence; the very nature of wonders requires that they should be rare; and this is a miraculous and wonderful circumstance, that men at the head of the governments in five separate provinces, and men at the head of the parties opposing them, all agreed at the same time to sink party differences for the good of all, and did not shrink, at the risk of having their motives misunderstood, from associating together for the purpose of bringing about this result. (Cheers.)

Source: The Martian Chronicles

"Passages from the life of a philosopher", Appendix, p. 489
Passages from the Life of a Philosopher (1864)

True Believer

Source: The Gray Wolf Throne

Source: Suzanne's Diary for Nicholas

Source: Jesus Before Christianity: The Gospel of Liberation (1976), p. 33.
Context: Miracles are very often thought of, both by those who believe in them and by those who do not, as events, or purported events, that contradict the laws of nature and that therefore cannot be explained by science or reason. But this is not at all what the Bible means by a miracle, as any Biblical scholar will tell you. “The laws of nature” is a modern scientific concept. The Bible knows nothing about nature, let alone the laws of nature.

"Miracles" (1942), p. 29
God in the Dock (1970)