Literary Masterpieces You've Often Attempted, But Never Finished

Was wondering last night about difference between "sadness" and "melancholy" (also between sadness and melancholy, re words/actual experience). And thinking that Burton's book drew from connotations of his time, like with humours---what say yall about any of that, book incl. or aside===?

I'd meant to maybe look it up today, but this thread appeared first.