" they, like you, were born to walk the like of shadows. One foot in the light and one in the dark. A few are scared enough of both that they stay in the middle and never pick a side. Others are strong enough to choose the light and stay firmly planted there, even while the darkness tries to claim them. And others are too weak or blind to fight the lure of the darkness. It overwhelms them with false promises and before they know what's happened it owns them. "

― Sherrilyn Kenyon , Illusion (Chronicles of Nick, #5)