"Mortals, everything is so black and white to you." (2.4.37)
This is an ironic statement coming from Macon, given that his family of Casters is Claimed to be either good or evil on their sixteenth birthday.
"It's a whole lot more fun being Dark than Light." (2.11.86)
Larkin would rather laugh with the sinners than cry with the saints. The sinners are much more fun.
"Whether you choose to feed on blood or not, you are still a Dark Creature." (2.11.121)
Macon's brother claims that being Good or Evil is in your very nature—it doesn't matter what kind of choices you make.