I’m certain this quote isn’t quite right.
I’m not certain if it was Lovecraft, Howard, August Derelith, or somebody else who wrote it.
Input?
Source?
Pie?
Not one reply?
To a Lovecraft Question?
On the SDMB?
Is this computer plugged in?
I’d like coconut cream, please.
There are others on the board far more knowledgeable about Lovecraft than me, I didn’t want to get in over my head. 
I don’t think it’s Lovecraft himself, I think I remember his more memorable phrases and your quote doesn’t ring any bells. It sounds like it could be a mangled memory of the opening to The Call of Cthulhu or possibly someone imitating his style. Or I could be talking completely out of my a$$. I’ve never read The Fungi from Yuggoth.
Sorry to be of absolutely no help.
Wrong season for pumpkin pie.
IANA SFbuff (not even in the same dimension as some of you Dopers), but it sounds like something Quatermass would say. Or, a character from one of Edgar Rice Burroughs dinosaur stories?
Go on, have a big horse-laugh, but I’ll be back for my pie in October. Be there. Aloha.
No, it’s from the Mythos.
You win a Circus Peanut.
It is stale.
It was Robert E. Howard, in The Black Stone.
Slight hijack, speaking of Quatermass, a friend sent me an audiobook called The Quatermass Memoirs that was very well done. Quatermass relating his “adventures”
Aren’t they all? 
Not always. Are they now?
He meddled in things man was meant to leave alone!
No Lovecraft expert I, but that sounds like a line from “At The Mountains of Madness”.
It doesn’t sound quite like Lovecraft. I could believe TOWP that it’s from Robert E. Howard’s Lovecraftian The Black Stone – it’s more his style – but I’m at work, and can’t check my collection.
In any event, plugging it into Google Books only turns up one source – this thread.
Well, yeah; plugging that in gets no useful hits, or else Bosda wouldn’t have posted.
But try plugging in “Man was not always master of the earth – and is he now?”
I’ve got Lovecraft’s complete work on my kindle and let some keywords of the alleged quote run through a search: the only passage that came close was from “The Dunwich Horror”, a passage from the Necronomicon actually:
Could that be the quote?
Possibly I’m being too subtle – or folks have me on ‘Ignore’ – or I made the mistake of not triumphantly specifying “Key Lime Pie” like a Doper in good standing.
Be that as it may, the penultimate sentence of Robert E. Howard’s THE BLACK STONE is as follows: “Man was not always master of the earth – and is he now?”
The Other Waldo Pepper (Johnson) is right! And The Black Stone is definitely a story in the Lovecraftian vein, ancient horrors and such, not a straight swords & sorcery story.
Sorry, that went over my head. The probability of me being obtuse is definitely higher than you being too subtle ;).
Here’s the story:
Spot on & many thanks.