Something that especially harms esoteric development is the untested, superficial and therefore objectively incorrect criticism that we often direct at people. I’m not saying that criticizing is wrong, but it should always be directed to facts and not at people whom one doesn’t happen to like.
Source: Rudolf Steiner – GA 266 – From the Contents of Esoteric Classes: Part II – Muenchen, 26th February 1912
The great Rudolf Steiner Quotes Site 