that Orwell quote can be saved a lot by proper punctuation
I am not, indeed, sure*,* whether it is not true to say that the Milton *(*who once seemed not unlike a seventeenth-century Shelley*)* had not become *-* out of an experience *-* ever more bitter in each year, more alien (sic) to the founder of that Jesuit sect*,* which nothing could induce him to tolerate.
Has the proper punctuation allowed you to see that there's an extra negation there that makes the sentence say the exact opposite of what the author intended it to say?
I am not, indeed, sure*,* whether it is not true to say that the Milton *(*who once seemed not unlike a seventeenth-century Shelley*)* had not become *-* out of an experience *-* ever more bitter in each year, more alien (sic) to the founder of that Jesuit sect*,* which nothing could induce him to tolerate.