Christianity is an outlook which sees in everything a revelation of the Divine. Everything material becomes an illusion unless we look on it as an expression of the Divine. If we disown the external world, we are disowning the Divine; if we reject the material realm, in which God has revealed himself, we are rejecting the Divine. The important thing is not to gaze into ourselves, but to seek to know the Great Self which shines down into us. […]
Really to go out of yourself is to renounce yourself. […] In the early days of Theosophy the gravest mistake was made when people were told to look away from the external world and to gaze into themselves. That is a great illusion, for then we find only the lower self, which imagines itself to be divine but is not so at all. We must come out of ourselves if we are to know the Divine. “Know thyself” means also “Overcome thyself”.
Source: Rudolf Steiner – GA 95 – At the Gates of Spiritual Science: Lecture XIV: Rosicrucian Training – The Interior of the Earth – Earthquakes and Volcanoes – Stuttgart, 4th September 1906