The entropy in that is actually quite low, especially if you have even just a slight bias towards popular poems. Given this info I think it'd be quite easy for a dedicated person to reverse a password hash of yours.

Phrases from published works aren't strong passwords no matter how long they are.

Here's a nice example from a few years ago - https://www.reddit.com/r/Bitcoin/comments/1ptuf3/brain_walle... where "a line from an obscure poem in Afrikaans" was considered secure.

Granted, your password hash isn't going to get as much effort as BTC brainwallet cracking, but phrases/lines from common poems are going to be in bruteforcer lists.

Also, for any targeted attacks, everything from every poet or band you've ever liked on facebook or mentioned in any online resource are going to be used against you, so you better use poetry from authors that you don't like or ensure that you have never talked about which authors you like (easier said than done). Checking every line from e.g. Shakespeare is easy.

I reckon on having >100 passwords. Whilst I might manage to remember the phrase I couldn't match them up to the context -- "she wishes for the cloths of heaven" is that Amazon or Etsy??

I have a manually maintained database with a bash one-liner for password generation; primarily I rely on my browser's password manager.

It was strong until you told us.

If it were me I'd add a bit of salt (some random string) to those...