The 3-legged stool of understanding is held up by history, languages, and mathematics. Equipped with those three you can learn anything you want to learn. But if you lack any one of them you are just another ignorant peasant with dung on your boots.
Robert A. HeinleinRemember though, your best weapon is between your ears and under your scalp -provided it's loaded.
Robert A. HeinleinDuty is a debt you owe to yourself to fulfill obligations you have assumed voluntarily.
Robert A. Heinlein