What must above all become strong and forceful are the soul experiences we can call the eminently moral ones. These imprint themselves as soul dispositions in firmness of character and inner resolute calm. Inner courage and firmness of character must most especially be developed, for through weakness of character we cripple the whole life of soul, which would then come powerless into the elemental world; this we must avoid if we hope to have a true and correct experience there. No one who is really earnest about gaining knowledge in the higher worlds will therefore fail to give weight to the strengthening of the moral forces among all the other forces that help the soul enter those worlds. One of the most shameful errors is foisted on humanity when someone takes it on himself to say that clairvoyance should be acquired without paying attention to strengthening the moral life.
Source: Rudolf Steiner – GA 147 – Secrets of the Threshold – Lecture III – Munich, 26 August 1913
Translated by Ruth Pusch