There was so much going on, and so little he cared to know about! - Michael Swanwick

Well, birth control's easy. The first thing you have to know is that it doesn't work."
"What?"
"Not consistently. No matter how careful you are, every time you play hide-the-salami with the boys, you're running the risk of ending up with a belly full of consequences."
"But—"
"Contraceptive spells are never entirely reliable. That's because their power comes from the Mother, and the Mother wants children. Each cantrip has its loophole, every fetish its flaw. Ultimately, contraception is just a way of luring you into playing her game."
"You mean that sooner or later it's going to fail me?"
"That's not what I said. It works well enough for enough of us that the rest will take their chances. But the odds are never going to be as good as you'd like them to be. There are no guarantees.

The law," Hoess suggested, "might not be entirely unhelpful here.

Let me explain to you," the Horned One said, "the nature of history."
"What?"
"The first thing you need to know is that history happens almost exclusively in the dark...Here is your second lesson: History is that which cannot be prevented...Here is your third and final lesson: History is simply life with all the bits any sane person might care to experience left out.