"tell heaven from hell"

Hello to all native or fluent English speakers! Do you know the band Pink Floyd? I'm a big fan of them and their texts, but there is a sentence in the song "Wish you were here" I don't really understand:
"So, so you think you can tell heaven from hell, blue skies from pain..."
Does this mean something like: "...you think you can describe / define heaven by (describing / defining) hell..."? Or "...you can devide heaven and hell (by words)..."? Or something else? I would be really very grateful if someone could help me.
Greetings

Hi,
"to tell something from something else" means to distinguish between them, to see the difference between them.
Hence, "you can tell Heaven from hell" means "you can see a difference between Heaven and Hell, you can't mistake one for another"
Different example: imagine a mother has 2 identical twins, Jill and Jenny. You'lll ask her "How can you tell Jill from Jenny?" and she'll answer "You can't except by their clothing!" or maybe "Jill has a scar on her forehead" or something like this

Thank you very much for this clear and plain explanation. It's very important for me.
By the way, I also swear by LEO, because it's a great dictionary.
Greetings

yes, it means distinguish. i'm also a fan of pink floyd