The historian must have some conception of how men who are not historians behave. Otherwise he will move in a world of the dead. He can only gain that conception through personal experience and he can only use his personal experiences when he is a genius.
I probably have the worst wardrobe. It's the most ill-fitting with the worst patterns and colors and the most nipple rubbage. There's bad chafing and it's always tight in all the wrong places. What's sad is that I'm kinda getting used to it.