A commander in chief ought to say to himself several times a day: If the enemy should appear on my front, on my right, on my left, what would I do? And if the question finds him uncertain, he is not well placed, he is not as he should be, and he should remedy it.
When a man fails to understand something he is conscious of a discord, and seeks for the cause of it not in himself, as he should, but outside himself - hence the war with what he does not understand.