"We are to be men of steel and ice and walk immune amidst the suppuration of the Earth" This quote is from an sf story I read when I was a child and I've never been able to find it again. Does anyone have an idea where it comes from?
The phrase "suppuration of the earth" has one Google hit other than this question. It's from a book about the works of David Rudkin:
As you can see, the partial quote mentioning that phrase also mentions immunity: "Searching the corridors, Gideon finds Jed in one cell... bowed by the weight of his head 'keeping all [his] foulness in', fixed on immunity from 'the suppuration of the earth'."
From what I gather, this would be from Rudkin's "Sons of Light," which seems to be a play. It's not much to go on, but it may be a clue for you or others.