The adversity hypothesis has a weak and a strong version. In the weak version, adversity can lead to growth, strength, joy, and self-improvement, by the three mechanisms of posttraumatic growth described above. The weak version is well-supported by research, but it has few clear implications for how we should live our lives. The strong version of the hypothesis is more unsettling: It states that people must endure adversity to grow, and that the highest levels of growth and development are only open to those who have faced and overcome great adversity. If the strong version of the hypothesis
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