Bob Marley once said, "You never know how strong you are until being strong is the only choice you have." Indeed, we don't know how strong-willed and determined we can be until our resolve is actually put to the test -- that is, until we face serious challenges that can cause us to doubt our ability to surmount them. Many of us are thrust -- in many cases, unexpectedly -- into very tough situations that force us to summon every bit of strength we can muster, like losing a loved one, getting laid off, or being cheated on. The fact that gradually we are able to get through these hard times and move on with our lives attests to the tenacity of the human spirit. Time really does heal. And just because you may not be as strong as your peers doesn't mean you're weak. Some of us have simply gone through more adversity in life, and those experiences have better prepared us for similar predicaments that may surface later on. What's more, some people are mor...