Possibly Studies in the Sermon on the Mount by Martyn Lloyd-Jones. I've benefitted more from my reading in that book than any other, and I can read it over and over.
I would have a hard time choosing. There are so many books that I would love to read that I don't have the time for right now. If I had to pick one out of the ones I have already read, I think it would be Holiness by J.C. Ryle.
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