No, I was disputing "mortality" while agreeing with "challenges", which I've written as problems in the nice sense of "please let me finish my problem". That's some historical figure's alleged last words, I think.

(Edit: probably an embellishment of Archimedes, supposedly saying to the Roman soldier who killed him, "do not disturb my circles!" - not exactly a plaintive attitude about mortality, more just being a grumpy geometrist.)