"His mother's unkept promise was at the core of who he was. He'd built his whole life around the irratation of her words, like the grain of sand at the center of a pearl. People lie. Promises are broken. That was why, as much as it chafed him, Jason followed rules. He kept his promises. He never wanted to abandon anyone the way he'd been abandoned and lied to."
January 1, 1970
https://en.wikiquote.org/wiki/Percy_Jackson_%26_the_Olympians