It is also well known to us that this anthroposophical spiritual stream brings into sharp collision two divergent tendencies in man’s thought and feeling and perception. One is a direction in thought and feeling which has been in preparation for many centuries and which has by now gained complete hold upon mankind, or will most assuredly do so in the near future. It is what we call the materialistic outlook, using the word in its widest sense, and it makes attack, so to say, upon the other direction of thought which is given with anthroposophy, it attacks the spiritual outlook on the world. And more and more pronounced will the conflict become in the near future between these two directions of thought. It will, moreover, be fought in such a way that it will often be very difficult to know with which direction of thought one is dealing. For the materialistic tendency of thought, for example, may not always come before one in unvarnished truthfulness, it may assume all manner of disguises. There will indeed be plenty of materialistic streams which will wear a spiritual mask, and it will be far from easy at times to know where materialism lurks and where we are to recognise the true spiritual stream.
Source: Rudolf Steiner – GA 134 – THE WORLD OF THE SENSES AND THE WORLD OF THE SPIRIT – Lecture I – Hannover, 27 December 1911
“The devil’s never noticed by some folk, even when he has them by the neck!” – Goethe