All knowledge sought after merely to gain more knowledge, merely to gather treasures for yourself, leads you astray. All knowledge however, that you seek in order to ripen and to be used in service of the ennoblement of humanity and for the sake of world evolution, takes you a step forwards on your way.
Source (German): Rudolf Steiner – GA 10 -Wie erlangt man Erkenntnisse der höheren Welten (page 28)
Translated by Nesta Carsten-Krüger
The great Rudolf Steiner Quotes Site 