So when, for example, you experience after death the pain of another man through having caused him pain on earth, you say to yourself at once: ‘If I did not feel this pain, I would remain an imperfect human soul, for the pain I have caused in the universe would continually take something from me. I only become a whole human being by experiencing this compensation.’
It may cost us a struggle to see that pain experienced after death in return for pain caused to another, is really a blessing. It will depend on the inner constitution of our soul whether we find this difficult or not; but there is a certain state of soul in which this painful compensation for many things done on earth is even experienced as bliss. It is the state of soul that results from acquiring on earth some knowledge of the super-sensible life. We feel that, through this painful compensation, we are perfecting our human being, while, without it, we should fall short of full human stature. If you have caused another pain, you are of less value than before; so, if you judge reasonably, you will say: In face of the universe I am a worse human soul after causing pain to another than before. You will feel it a blessing that you are able, after death, to compensate for this pain by experiencing it yourself.
Source: Rudolf Steiner – GA 234 – Anthroposophy, An Introduction – Lecture IX – Dornach, 10th February 1924