Someone might come along and say: It is quite right that things should have gone wrong with that person, for this is the retribution for what he did during his past incarnation. It is very reasonable that things should have taken this course, because his Karma demands it. People who say this do not understand Karma, for to understand Karma we must know that another person’s Karma does not concern us at all! The fulfillment of Karma will come of its own accord; our only task is to help him! We must, however, draw in everything which might bring about a favourable change in his Karma. To know and to feel this forms part of a deep understanding of Karma and its laws.
Source- Rudolf Steiner – GA unknown – Morality and Karma – Nuremberg, November 12th, 1910
The great Rudolf Steiner Quotes Site 