How do we learn and grow from adversity? Think about the family that lost all their possessions in the hurricane, or the guy who went through rounds of chemotherapy, or the woman who lost her limbs. In the end, many of these people do say: I am a better person because of it. According to them, you can't find real happiness unless you experience such fights for your life.
Research on how to increase positive moods and capitalize on your strengths has proliferated in recent years, thanks to the positive psychology movement, and has shed light on ongoing insights into personality, mood, and cognition.