For God to prove himself on demand, physically, would be a grave disappointment, and the strongest Christians should be considerably grateful that he chooses not to do so. The skeptic endlessly demands proof, yet God refuses to insult the true intelligence of man, the '6th sense', the chief quality, the acumen which distinguishes man from the rest of creation, faith.
I didn't expect to recover from my second operation but since I did, I consider that I'm living on borrowed time. Every day that dawns is a gift to me and I take it in that way. I accept it gratefully without looking beyond it. I completely forget my physical suffering and all the unpleasantness of my present condition and I think only of the joy of seeing the sun rise once more and of being able to work a little bit, even under difficult conditions.