Paul Graham is probably the most prolific writer of technology entrepreneurship of our times. His widely read blog on startups and technology has some of the most fundamental lessons in starting new companies. I think a lot of what he writes applies to anyone starting anything new, for example someone starting a new movement.
While I have always loved his writing (and in-person advice), my favorite piece by PG is actually not an essay (or not originally intended to be so). It was his talk at the startup class at Stanford, run by Sam Altman. I have seen this so many times, and continue to enjoy watching it from time to time. It has a depth of truism that you seldom get to experience. Hope you enjoy it!