Someone once told me the one thread that runs through them all is a premium on personal courage - not intellectual courage, but just plain physical courage. ↗
These rules may seem simple enough, but it will require great morale and physical courage to adhere to them. But if carried out in the strict sense of the word it will surely lead to a greater success than could otherwise be attained. ↗
Physical courage, which despises all danger, will make a man brave in one way; and moral courage, which despises all opinion, will make a man brave in another. ↗