Well-- for me, it's because of this thing.

[He rummages in his pocket for a moment and pulls out a small, faintly glowing stone etched with a symbol. After holding it up for a moment he stows it away again.]

But there are guiding principles as well. I'm sure we can use those... [Tapping his forefinger to his chin, he furrows his brow slightly in thought.] First off, what are you having trouble with?