If throughout his reign Napoleon gave commands concerning an invasion of England and expended on no other undertaking so much time and effort, and yet during his whole reign never once attempted to execute that design but undertook an expedition into Russia, with which country he considered it desirable to be in alliance (a conviction he repeatedly expressed)⁠—this came about because his commands did not correspond to the course of events in the first case, but did so correspond in the latter.

For an order to be certainly executed, it is necessary that a man should order what can be executed. But to know what can and what cannot be executed is impossible, not only in the case of Napoleon’s invasion of Russia in which millions participated, but even in the simplest event, for in either case millions of obstacles may arise to prevent its execution. Every order executed is always one of an immense number unexecuted. All the impossible orders inconsistent with the course of events remain unexecuted. Only the possible ones get linked up with a consecutive series of commands corresponding to a series of events, and are executed.