I was getting a bit dismissive of endgames.
My quote was two letters different from the setter's, so I passed on the option of trying to pick out the letters of their quote, minus some other letters, to form a picture. Life's too short as you get older!
Then a cube emerged (with some hints here) but I had no idea how to draw one with unambiguous pips. Let it go. (though as a retired senior citizen I have no excuse!)
This time hints here have guided me towards a clear solution, with respect for the puzzle's construction.
I'd question the inclusion of one subject, but that's another story.