Whether you think of Nietzsche or Kanye West when you hear the line "what doesn't kill you makes you stronger"–you probably think of it as true. Or at least I did. Short term struggle builds long term strength. Even life's toughest experiences have a redeeming quality inasmuch as it instructs or inspires or hardens or softens a person in the right away. Etc.
Christopher Hitchens is dying of cancer. He's undergoing radiation. In Vanity Fair he reflects on the maxim that I took as fact–and finds it false.
In the brute physical world, and the one encompassed by medicine, there are all too many things that could kill you, don’t kill you, and then leave you considerably weaker.
On the pain he felt:
To say that the rash hurt would be pointless. The struggle is to convey the way that it hurt on the inside. I lay for days on end, trying in vain to postpone the moment when I would have to swallow. Every time I did swallow, a hellish tide of pain would flow up my throat, culminating in what felt like a mule kick in the small of my back. I wondered if things looked as red and inflamed within as they did without. And then I had an unprompted rogue thought: If I had been told about all this in advance, would I have opted for the treatment? There were several moments as I bucked and writhed and gasped and cursed when I seriously doubted it.
So far, I have decided to take whatever my disease can throw at me, and to stay combative even while taking the measure of my inevitable decline. I repeat, this is no more than what a healthy person has to do in slower motion. It is our common fate. In either case, though, one can dispense with facile maxims that don’t live up to their apparent billing.
Here's a touching book trailer about dying. I've rarely seen someone on camera who appears truly at peace in life. Lee Lipsenthal does. He passed away a couple months ago. His book, Enjoy Every Sandwich, came out last month.