I finished reading the book and am leaving a review here. I first encountered programming with SICP, and gave up at the end of the first chapter. I feel like I completed the unfinished emotion I felt at that time with this book. In particular, I think I read the first chapter more than 7 times, but after that, the latter part of the book was easy to read. It is a good book. I think functional style programming is not only practical, but also beautiful and touching. I am grateful to the author for leaving a good book and lecture.