What is the author's style in The Screwtape Letters by C. S. Lewis?

No one uses the English language quite like C.S. Lewis does. His style is clear, humorous, and yet telling. He is a master of the final line—his closing lines are often the most powerful and thought-provoking in the piece. Lewis is never sloppy in his use of language. He is always fastidious, and his words are always consummately well chosen. He writes, however, with a certain freshness and simplicity which make him a delight. One need not be a theologian or a scholar to enjoy this book or to understand it.