“Everlasting misfortune does have one blessing, that it ends up by toughening those whom it constantly afflicts.”
“…so you must now offer yourself bravely for treatment…For all your sorrow have been wasted on you if you have not yet learned how to be wretched.
“That a soul which has conquered so many miseries will be ashamed to worry about one more wound in a body which already has so many scars.” – Seneca, On the Shortness of Life
Misfortune has a silver lining. It makes you more resilient to future misfortune. So, however unpleasant your past struggles are to hold on to, it’s important that you do not forget them. In addition to providing a learning opportunity, they help put future difficulties in proper perspective.