While you are failing to define success (and thereby rendering it impossible) you are also refusing to define failure, to yourself, so that if and when you fail you won't notice, and it won't hurt. But that won't work! You cannot be fooled so easily - unless you have gone very far down the road! You will instead carry with you a continual sense of disappointment in your own Being and the self-contempt that comes along with that and the increasing hatred for the world that all of that generates (or degenerates).
— 12 Rules for Life: An Antidote to Chaos
by Jordan Peterson