I should have learned this, she thought. I wanted to learn fire, and pain, but I should have learned people. - Terry Pratchett

Granny Weatherwax was often angry. She considered it one of her strong points. Genuine anger was one of the world's greatest creative forces. But you had to learn how to control it. That didn't mean you let it trickle away. It meant you dammed it, carefully, let it develop a working head, let it drown whole valleys of the mind and then, just when the whole structure was about to collapse, opened a tiny pipeline at the base and let the iron-hard stream of wrath power the turbines of revenge.

"The secret is not to dream," she whispered. "The secret is to wake up. Waking up is harder. I have woken up and I am real. I know where I come from and I know where I'm going. You cannot fool me any more. Or touch me. Or anything that is mine."

It is important that we know where we come from, because if you do not know where you come from, then you don't know where you are, and if you don't know where you are, you don't know where you're going. And if you don't know where you're going, you're probably going wrong.