You don’t know anyone at the party, so you don’t want to go. You don’t like cottage cheese, so you haven’t eaten it in years. This is your choice, of course, but don’t kid yourself: it’s also the flinch. Your personality is not set in stone. You may think a morning coffee is the most enjoyable thing in the world, but it’s really just a habit. Thirty days without it, and you would be fine. You think you have a soul mate, but in fact you could have had any number of spouses. You would have evolved differently, but been just as happy.