When I used to teach civil procedure as a law professor, I would begin the year by telling my students that 'civil procedure is the etiquette of ritualized battle.' The phrase, which did not originate with me, captured the point that peaceful, developed societies resolve disputes by law rather than by force.
The smartest thing I did in law school: asking my future wife to go out dancing with me. The smartest thing I did when practicing law: quitting. The smartest thing I've done in writing: following my own head and writing what I wanted to write, and nothing but.