Will
Discussed here.
I have a theory I fervently hope is wrong: At some point, a society may inevitably become ethically advanced enough that it no longer has what is necessary to survive against the barbarians.
Is the concept of western civilization inherently self-limiting?
Note that if Ghandi had been dealing with a different kind of society other than the relatively civilized British, he would have lasted about two days. Pacifism requires a protective refuge to survive.