It is obvious that a very deep relationship exists between the spirit of man and the world of existence. It often happens that what we see in a dream comes to pass in wakefulness; indeed, even in wakefulness when the soul is unfettered, matters come to mind which later appear in visible form. This shows that between the reasoning power of man and that visible appearance there is a spiritual connection. Furthermore, the spirit of man has the power of discovering facts. When this power is realized, problems become easily resolved. Amusingly, while materialists are engaged in making discoveries concerning the strata of the earth, they are immersed in the very spiritual power whose potency and influence they deny. They also claim to forecast coming events.
(From a conversation by ‘Abdu’l-Baha, June 10, 1912, New York,