Success is the development of the power with which to get whatever one wants in life without interfering with the rights of others.
So Marxism, Freudianism: any one of these things I think is an irrational cult. They're theology, so they're whatever you think of theology; I don't think much of it. In fact, in my view that's exactly the right analogy: notions like Marxism and Freudianism belong to the history of organized religion.