In Abraham Lincoln: Vampire Hunter, there are several types of strength and skill, and Abe has most of them. He's strong, he writes well, he speaks persuasively, and his breath is always minty fresh. But he wasn't always this skilled of a guy. He has to work and train to be strong and eloquent. And he has to train hard, because the folks he's going up against aren't so easy to beat (being the walking dead, and all). He may be strong, but vampires are stronger. He may learn to speak persuasively, but his opponent is the entire slavery-industrial complex. In short, Abe needs all the strength and skill he can get.