C.S. Lewis, Miracles:
Any day you may hear a man (and not necessarily a disbeliever in God) say of some alleged miracle, “No. Of course I don’t believe that. We know it is contrary to the laws of Nature. People could believe it in olden times because they didn’t know the laws of Nature. We know now that it is a scientific impossibility.” (…)
The idea that the progress of science has somehow altered this question is closely bound up with the idea that people “in olden times” believed in them “because they didn’t know the laws of Nature.” Thus you will hear people say, “The early Christians believed that Christ was the son of a virgin, but we know that this is a scientific impossibility.” Such people seem to have an idea that belief in miracles arose at a period when men were so ignorant of the course of nature that they did not perceive a miracle to be contrary to it. A moment’s thought shows this to be nonsense: and the story of the Virgin Birth is a particulary striking example. When St. Joseph discovered that his fiancée was going to have a baby, he not unnaturally decided to repudiate her. Why? Because he knew just as well as any modern gynæcologist that in the ordianary course of nature women do not have babies unless they have lain with men. (…)
We have already seen that if you begin by ruling out the supernatural you will perceicve no miracles. We must now add that you will equally perceive no miracles until you believe that nature works according to regular laws. If you have not yet noticed that the sun always rises in the East you will see nothing miraculous about his rising one morning in the West.