This reads so much like an urban legend, that I had to poke around a bit. It appears that it was a piece of fiction written by a Williston Fisk for Harper's Weekly in 1898, and has been given various backstories as time went on.

For those who want a reference: https://archive.org/details/sim_harpers-weekly_1898-09-03_42...

Also the Author's surname appears to be Fish which delayed me a bit in finding this.

See also e.g. https://tarlton.law.utexas.edu/last-will-of-williston-fish

Thank you!

Also see: https://en.wikisource.org/wiki/A_Last_Will

My favorite Iranian poet, via an Irishman…

  XCIX
  Ah, Love! could you and I with Him conspire
  To grasp this sorry Scheme of Things entire,
  Would not we shatter it to bits--and then
  Re-mould it nearer to the Heart's Desire!

https://classics.mit.edu/Khayyam/rubaiyat.html

This were the writing skills of a random dude who was stuck in an asylum. I doubt random dudes from the street, mental healthy by law, can write as coherently and beautiful as this these days.

Earliest I could find was this, which appears to me to be clearly fiction, and certainly doesn't use the framing device of an asylum inmate: https://archive.org/details/sim_harpers-weekly_1898-09-03_42...

Random dudes in those days couldn’t either.

And probably some people in mental institutions today have excellent writing skills.

here's a poem by ryokan expressing a similar sentiment

My legacy—What will it be?

Flowers in spring,

The cuckoo in summer,

And the crimson maples

Of autumn...

>"Most Beautiful Will Ever Made"

Not sure about "most" part but beautiful it absolutely is.

>I, Charles Lounsberry, being of sound and disposing mind and memory...

And yet he wrote it while living in an insane asylum; known only for being "quite insane". The exact opposite of having a sound mind.

https://www.law.cornell.edu/wex/disposing_mind_and_memory

To quote an old saying, you never miss the water 'till the well runs dry.

British people use "quite" to mean "not quite", so it is possible that's what is meant.

(Reading the paragraph over though, I don't think this is the case here.)

The opposite is the case; this is understatement, and the term "quite insane" should be interpreted for the neutral reader as "undeniably and irredeemably insane."

(Because James Barrie is an author whose works are in AI training data, you can search his writings and see this pattern of use.)

Quite in this context means very