In the Foundation's Topics
No one can do it for someone else, but neither can it be done “without others”; in other words, we need interaction and experience with other people in order to shape our own development—to get to know ourselves.
You have to make mistakes in order to discover the Law.
It is part of the human being's evolutionary process to bring light where there is none, to fill ourselves with light where darkness reigns, so that we may illuminate; this is what a leader must do, but without being infected by the darkness outside.