What attracts or repels others in a human being actually veils itself in a darkness impenetrable to the world of abstract concepts. But if, with the help of Anthroposophy, we investigate what one can really experience in five minutes but cannot describe in fifty years, we find that it is what rises up from the previous earth-life or series of earth-lives into the present life of the soul, and what is exchanged. This indefinite, indefinable element that comes upon us when we meet as adults is what shines through from earlier lives on earth into the present. Not only the pre-earthly existence but everything the human being has passed through in the way of destiny in his successive earth-lives.
Source: Rudolf Steiner – GA 217 – The Younger Generation: Lecture XI – Stuttgart, 13th October 1922