Deeply ingrained into the fabric of all creation is a law that every action must have a reaction. There are no exceptions to the rule. Every choice in life – every thought, word, and action – brings a return of circumstances with it. You will reach the age of thirty only by traveling the road through eighteen, twenty-one, and twenty-five. And the choices in life during those quickly passing years will entirely determine the person you will be at thirty.

~Josh Farrar, quoted in How to Ruin Your Life by 30 by Steve Farrar