I might have drifted on for my whole life as a psychical Researcher, showing a sympathetic, but more or less dilettante attitude towards the whole subject, as if we were arguing about some impersonal thing such as the existence of Atlantis or the Baconian controversy. But the War came, and when the War came it brought earnestness into all our souls and made us look more closely at our own beliefs and reassess their values. In the presence of an agonized world, hearing every day of the deaths of the flower of our race in the first promise of their unfulfilled youth, seeing around one the wives and mothers who had no clear conception whither their loved ones had gone to, I seemed suddenly to see that this subject with which I had so long dallied was not merely a study of a force outside the rules of science, but that it was really something tremendous, a breaking down of the walls between two worlds, a direct undeniable message from beyond, a call of hope and of guidance to the human race at the time of its deepest affliction. The objective side of it ceased to interest for having made up one’s mind that it was true there was an end of the matter. The religious side of it was clearly of infinitely greater importance.
Sir Arthur Conan Doyle. The New Revelation (Kindle Locations 215-224).