Deep thinking, if you use the right direction, make a breakthrough, and completely understand the underlying mechanism of something from beginning to end, you will have a deep and huge sense of satisfaction similar to flow. But the problem is that you can't know which direction can lead to breakthroughs from the beginning, so you can only touch here and touch there, and accumulate a lot of materials. Suddenly one day, you feel that you are about to string them together, and you will be very excited. I agree with some of the principles of "Deep work" in this book, but I don't agree with the suggestion of "quit social media". The correct use of social media can help you speed up in-depth thinking, discover new connections and directions, and avoid wasting time in dead ends. The benefits are many.