"I read somewhere, one, that crying defies scientific explanation. Tears are only meant to lubricate the eyes. There is no real reason for tear glands to overproduce tears at the behest of emotion. I think we cry to release the animal parts of us without losing our humanity. Because inside of me is a beast that snarls, and growls, and strains toward freedom, toward Tobias, and, above all, towards life. And as hard as I try, I cannot kill it."

Source: Veronica Roth (2012). “Free Four: Tobias Tells the Divergent Knife-Throwing Scene”, p.6, Harper Collins