A study of anthroposophical works is an effective preparation for exercises. It’s better to have read a book 25 times than to read five books five times each, and one who has read a book two or three times shouldn’t imagine that he’s read it at all. If on a particular day of the year, we have experienced this or that in our meditation, then if we’ve really studied hard in between, we’ll be able to experience much more on the same day a year later. It’s good to keep on doing the same exercise for long periods; that’s much better than continual changes.
Source: Rudolf Steiner – GA 266 – From the Contents of Esoteric Classes: Esoteric Lessons Part II – Berlin, 15th March 1911
The great Rudolf Steiner Quotes Site 