In our present materialistic age, one can be a downright materialist, another a downright spiritualist. People belonging to either current can present their beliefs in a similarly convincing manner. The question, however, is not so much about the words one uses to declare his conviction. The question is: what is the spirit that really lies behind the words? What matters is not the literal content of words, but the spirit at their origin. Words alone are only good for those who are satisfied with concepts, not reality.
Source (German): Rudolf Steiner – GA 196 – Geistige und soziale Wandlungen in der Menschheitsentwickelung – Dornach, 1 February 1920 (page 139)