"My expectations for my marriage to Susan involved a lot of 'for better' and 'for richer' and 'in health.' Sure, I promised 'for worse' and 'for poorer' and 'in sickness,' but I didn’t expect hard times in marriage, until we had them. And in those early years, I realized that marriage is not just made for the best of times. Your marriage, and mine, is made for tough times—which can actually strengthen your marriage. Here’s how....."