Mark D. Seery of the University at Buffalo published a paper on the psychological effects of adversity vs resilience. He concludes that a little adversity is actually good for you. But, how much is “too much” adversity depends on each person’s resilience. Many studies have shown that traumatic events can cause long-lasting psychological damage.
The common wisdom is “That which doesn’t kill you makes you stronger” – which is not supported by scientific evidence. Quite the contrary, most evidence points to the opposite – that which doesn’t kill you makes you weaker, at least psychologically.
However, Seery contends that a little trauma actually strengthens your resilience – a bit like exercise traumatizes yet strengthens muscles. Just like in the case of strengthening muscles by traumatizing them (to build muscle, one must damage muscle cells a little), a few traumatizing events in one’s lifetime can strengthen their resilience after future traumas.


According to an article from the University of North Carolina at Chapel Hill, memories you want to forget are the hardest ones to lose. This may explain why some memories can "haunt" you all your life.


