The theory of the indirect approach operates on the line of least expectation.
In war, the chief incalculable is the human will.
A complacent satisfaction with present knowledge is the chief bar to the pursuit of knowledge.
The only thing harder than getting a new idea into the military mind is to get an old one out.
If you wish for peace, understand war.
For even the best of peace training is more theoretical than practical experience ... indirect practical experience may be the more valuable because infinitely wider.