Okay, confession time. Until today, I had never read The Screwtape Letters in its entirety. I had enjoyed some excerpts, having taken a course on C.S. Lewis in college, and I'd seen other writers reference bits and pieces. But with a demanding TBR pile, I just never got around to the whole thing, until now. What's my impression? In a nutshell, The Screwtape Letters isn't a comforting book, nor always easy to read. But it is a surprisingly edifying morsel I'd call vital to Christian libraries.C.S. Lewis can be a challenging author in the best sense and he didn't back down here. First, just by using a demon as a narrator, he challenges Christian readers in particular to think backwards. That is, at times, I found myself a bit worried about Wormwood's fate. So I had to remind myself, "Hold up, they're demons." As the afterward puts it, demons' lights are my (our) darks, and so forth. But in thinking backwards, I was always challenged to read on, keep learning, keep inverting, and remind myself of the truth. Yes, even and especially the truth I thought I already knew.That's another big point in the book's favor. Lewis can get verbose at times. I did skim a couple sections, most notably the ending Toast (though there are some absolute gems in there I'll get to in a minute). But in weeding through the verbose and rather archaic language, I challenged myself, "Okay, what's being said here?" And more specifically, what makes this book, about a fictional male living in WWII England, valuable and accessible to me, a 21st-century American woman who has only known war in a faraway sense?The answer is, a LOT is being said in The Screwtape Letters, all of it valuable. In fact, I'd recommend reading some pieces twice or you might miss something. Again, inverting and adjusting your thinking is required; you're not dealing with a sympathetic narrator. Once you've "adjusted the settings," though, you'll rediscover some great truths not about hell and demons, but about God, Christ, and Heaven. These truths include His persistent love for humanity, to the point of (alleged) recklessness, His patient wooing of the nonbeliever and backslider, His interest in even the most mundane prayers, and His desire for everyone He has created to be in Heaven with Him. It's all a great reminder, especially if like me, you've ever found yourself saying, "Why did I get into this Christianity gig in the first place?"That being said, be alert for some hard but vital truths about demons as well. As hard as it is, pay attention to how Screwtape talks about humans--"animals," "food," "putrid," and similar adjectives and slurs. He could be "humorous" in a dry, dark sort of way, in that he kept bashing Christians and I would smirk and say to myself, "You have no idea who we really are and can be."But Screwtape and his demon compatriots are not funny. They are reminders that Satan and demons hate you, they will twist anything, even the most joyful and pure, to turn you against God, and their ultimate goal is to devour your soul. It's sobering to say the least, but it will make you think. I looked up for my Kindle for short prayers at various points. These often sounded like, "Yes, he's right, humans fall into this, I fall into this, God protect me. He may not have access to my soul but that doesn't make me invulnerable."Speaking of being a vulnerable human, I think that's the greatest lesson of The Screwtape Letters and why it's a classic. It's truly an evergreen book. That is, if you can't relate to the Blitzkrieg, rationing, and other hardships of WWII, you can certainly relate to being drawn into things like pride, lust, gluttony, and the other seven deadly sins. If you say to yourself for example, "I've not been taken in by discussions of the 'historical Jesus'," well one, you probably have and don't know it. Two, even if you haven't, some other version of fake Christianity or fake Jesus has probably caught your attention. I was even amazed--though I shouldn't be--at how on target Lewis' "Toast" was in its commentary on philosophies and perceived dangers Christians wrestle with right now. Nothing new under the sun, indeed.I docked a star only because as noted, the language can be on the wordy, archaic side. And though this is more a suggestion or critique and will never be answered, I agree with Lewis that I'd have liked to see some counterpoint from the human's guardian angel. (Although, I do see what Lewis meant when he said he couldn't write that because, how do you adequately and accurately capture such)? Besides those critiques though, I have no issues and highly recommend this book. Is it as important as the Bible? No. Is it as informative as some other books on similar subjects? Maybe not. Still, it speaks to readers in their frail humanity so well, I'd say you must have it as a resource.