We are not our own any more than what we possess is our own. We did not make ourselves, we cannot be supreme over ourselves. We are not our own masters.
One of the principal functions of a friend is to suffer (in a milder and symbolic form) the punishments that we should like, but are unable, to inflict upon our enemies.
Ironically enough, the only people who can hold up indefinitely under the stress of modern war are psychotics. Individual insanity is immune to the consequences of collective insanity.