Of late, I've found myself recalling lines from "Invictus" (the "I'm the captain of my soul poem) by William Ernest Henley.
For me it resonates most for its sheer tone of defiance as I can apply it day to day life:
In the fell clutch of circumstance
I have not winced nor cried aloud
Under the bludgeonings of chance
My head is bloody, but unbowed.
I hope I can always be that strong.