P.D. Ouspensky
Author: P.D. Ouspensky
Publisher: Vintage (1971)

Q. If man can 'do' nothing, does it follow that all he can do is to control his own mental reaction to events outside his control? A. Quite right. That is the beginning. If he learns to control his reactions, then after some time he will find that he can control more and more, and later it may happen that he will be able to control, again not all, for there is a very large gradation, but certain external events. But certain other external events cannot be controlled because they are of a different size.