So it is possible to go, or rather to slip, from the sense world into the supersensible world and to live there as well as here. That does not mean life in never-never land, but life in a realm that clarifies and explains life in our realm.
Just as the usual person who has not studied electricity would not understand all the wonderful workings in a factory powered by electricity, so the average person does not understand the occurrences in the spiritual world. The visitor at the factory will lack understanding as long as he remains ignorant of the laws of electricity. So also will man lack understanding in the realm of the spirit as long as he does not know the laws of the spiritual.
There is nothing in our world that is not dependent on the spiritual world at every moment. Everything surrounding us is the external expression of the spiritual world. There is no materiality. Everything material is condensed spirit. For the person looking into the spiritual world, the whole material, sense-perceptible world, the world in general, becomes spiritualized. As ice melts into water through the effect of the sun, so everything sense-perceptible melts into something spiritual within the soul which looks into the spiritual world.
Source: Rudolf Steiner – GA 54 – Esoteric Development: Lecture I – Berlin, 7th December 1905