Each day brings challenges, to be sure, but it also brings at least one reason to smile and cherish life. Maybe it's the mere fact that you're alive to see another day. Maybe it's your spouse, kids, friends, or pets. Perhaps it's your extensive book collection, side business, or the charities you're active in. Whenever I feel the urge to complain about something, I quickly try to cancel out that negative feeling by thinking about something I'm deeply appreciative for and passionate about. As bad as things get, there's always a silver living that can turn our frown into a smile -- however fleeting it may be.  Even if you've come across a string of bad days, if today is even slightly better than yesterday, that alone is a step in the right direction. For example, let's say you're on a diet and are aiming to drop 20 pounds. After a day or so of dieting, you weigh yourself and, to your dismay, you've actually gained a pound. You repeat t...