Well, they did collaborate on Have Spacesuit: Will Travel There and Back Again.
Which wasn’t nearly as good as Tolkien’s collaboration with Niven: Lord of the Ringworld
Or his other collaboration with Heinlein: Farmer Giles of Ham In the Sky

What the fuck does your “confusion” have to do with your snarky & aggressive comment?
We WERE talking about Heinlein quotes, yes?
My comment was correct, was it not?
It wasnt a hijack.
“Which wasn’t nearly as good as Tolkien’s collaboration with Niven: Lord of the Ringworld” has** exactly what** to do with * OP looking for a quote from a book about a specific topic*?
“Or his other collaboration with Heinlein: Farmer Giles of Ham In the Sky” what does that have to do with **Heinlein quote about abandoning possessions
**??
*The OP was looking for a quote from a book about a specific topic. It was provided. Or were you responding to some other thread?
*
You commented, “Just because Heinlein had a character say in in one of his stories doesn’t mean he personally believed it.”. No one mentioned anything about what he believed until you brought it up.
Geez, lighten up. Deth be not proud.
No one asked for joke posts either. But we do that and it’s not usually a issue.
One of my favorite lines from the tolkien/Heinlein collaborations is:
I am a servant of the Secret Fire, wielder of the flame of Anor;. You cannot pass through tomorrow.
I prefer their poetry, especially “The Glory Road Goes Ever On”
Or his non-fiction collaboration with Niven and Pournelle “Beowulf: the Monster and the Critics’ Children.”
[Mod Note]
DrDeth, cool it. And everyone bouncing off of DrDeth, cool it, too. We’ve established that Heinlein’s views did not necessarily correspond with any given character of his, and we all agree that that’s true, so there’s no point arguing over it.
Wait - you’re a Mod now? Congratulations…you poor poor bastard. 
Oh, I think he knows what he’s in for.
I don’t live in Fetters, but I must be close.
I think if my house caught fire, I’d kick the dogs out the back door, come back to the couch and go up with all my shit.
If my garage caught fire, there would be no question.
Do you have the reference for this one? Sounds good, but is it Heinlein?
It’s from Heinlein but may be itself an embedded quote. My once-eidetic recall of the RAH canon is now just I.D.etic (as in “I Dunno…”) and my backup resource had the discourtesy to drop dead a couple of years ago. Pretty sure it’s from one of the first two Lazarus stories, but I will check with my remaining co-brains to see.
Spare brain #2 got it. It’s from the postwar article “How to Be A Survivor”:
I am pretty sure he used the same phrasing, again as an offhand quote, somewhere else in the fiction.
It’s Lazarus Long, I feel certain of it. Something about being ready to abandon his luggage.
It is from Heinlein, but I’ve read so much of his work that I can’t recall which specific work. Maybe “Number of the Beast” which, because it wasn’t his best work, tends to be overlooked. I do recall that the people in that work had to flee their home universe.