When do we speak legitimately of the spirit? When do we speak truly of the spirit? We speak truly of the spirit, we are justified in speaking of the spirit, only when we mean the spirit as creator of the material. The worst kind of talk about the spirit — even though this talk is often looked upon today as very beautiful — is that which treats the spirit as though it dwelt in Utopia, as if this spirit should not be touched at all by the material.
No; when we speak of the spirit, we must mean the spirit that has the power to plunge down directly into the material. And when we speak of spiritual science, this must he conceived not only as merely rising above nature, but as being at the same time valid natural science. When we speak of the spirit, we must mean the spirit with which the human being can so unite himself as to enable this spirit, through man’s mediation, to weave itself even into the social life.
A spirit of which one speaks only in the drawing room, which one would like to please by goodness and brotherly love, but a spirit that has no intention of immersing itself in our everyday life — such a spirit is not the true spirit, but a human abstraction; and worship of such a spirit is not worship of the real spirit, but is precisely the final emanation of materialism.
Source: Rudolf Steiner – GA 194 – The Mysteries of Light, of Space, and of the Earth: Lecture I: Their Reflection in the Three Streams of Materialism– Dornach, December 12, 1919