Can the dead speak?

People often talk about "going beyond the limits". Think of Beethoven: he was able to compose in spite of deafness. My idea is that, with all due respect to Beethoven, the limits can not be overcome. It would be really nice to see that the acknowledged limits are there, but they can be overcome: it is a convoluted way to say that "there are no limits." But there are limits: the biggest limit is death. Then there are physical limits: we can not stay awake for days, without food, without drink, etc.. So, why do we hear about "pushing the limits"? In my opinion this is due to two misunderstandings.

First, the limits of a person often do not coincide with the limits of another person. If Beethoven is deaf and also I'm deaf, he will compose music but I will not. The limit "deafness" for me will be more "limiting". This does not mean that Beethoven has exceeded the limits, he has remained within its limits (which, in this case, are different from mine). Or the same can be said of those who have a higher threshold of pain than another.

The second reason is that the dead can't speak. We hear only the voice of someone who has made the grade. Who succumb doesn’t speak and to most people it seems as he has never existed. If Beethoven, with all his talent, would have met the greatest limitation, death, when he was 15, no one would now have the slightest idea of who is Beethoven. The people who seem to have "crossed the line" have actually remained within their means. Maybe getting the best of their residual capacities, but always within the confines of the "limit". There is no wonder why Beethoven composed as a deaf: he did nothing of ultra-human. He took advantage, this we must admit, of his ability, he was able to move with strength and perseverance within his limitations. But he wasn't a superhero. Nobody is.

To be clear, I'd change idea and believe that it is possible to "go beyond the limits", only if it turns out that Beethoven composed something after 1827.