What you know and what you do
As the old saying goes, "easy to have three training, one training is easy, two training is easy, three training is not easy", "easy with heaven and earth", is not the same with common sense? We live in common sense, "spring", "autumn", we use them without thinking, is simple; The same thing has different manifestations at different times, changing infinitely, is to become easy; Common sense comes from life, and it is not easy to apply for a long time. Therefore, Zhuangzi said, "The way is defecating." Because of common sense, we are calm in life.