As the saying goes: "It is easy to have three practices, one is simple, the other is easy, and the third is not easy". Isn't it the same for common sense to "integrate heaven and earth"? We live in common sense, "spring blossoms" and "autumn is crisp", and we use it without thinking, for simplicity; The same thing has different manifestations at different times, changing endlessly, and changing for the sake of change; Common sense comes from life, and long-term application is not easy. Therefore, Zhuang Ziyun said, "Tao is defecating." Because of common sense and life, we are calm.

Lao Tzu said, "Elephants are like hope". It is precisely because common sense is so used to us that we often don't realize it, just as time and space are too static and absolute for us. We were cheated for thousands of years before Ai Shi. So we suddenly understand that although common sense is universal, we should know it, do it and think about it.

The so-called common sense knowledge is not only a natural reflection of clothes being hot and cold, but a careful observation of natural existence. Without this intention, how can there be common sense? How to do without common sense? If you don't do it, you will be in trouble. For example, for people, knowing the time of traffic jam will not delay the appointment; For example, Napoleon didn't know the vastness of Russia and the cold in winter, because Russia's solid walls and wilderness laid the groundwork for the Battle of Waterloo.

So for common sense, you should know.

The so-called practical common sense is not only the physical evidence after knowing, but also the necessity of life. The reason why we should know and do is because it is easier to know than to do. It's hard to do, so it's special. Common sense is to sleep when you are sleepy and rest when you are tired. Zhuge will take advantage of the situation to divide the world, and Liu Bang will know that Chu is strong and Han is weak and strong. Common sense is to conform to nature and keep pace with the times, so we can seek advantages and avoid disadvantages, so we have the spirit of awakening the world in the Han Dynasty.

So do it for common sense.

As for thinking about common sense, it is a higher requirement after the integration of knowledge and practice. It is because of common sense that we are invisibly ignored and used to it. However, everything in the world is always changing, which is not suitable for us to stick to. If we stick to what we have, we will never make progress. Therefore, the dish of soup said: "New is new, new is new"; Zhao Kang said: "Be a new citizen"; Ceng Zi said: "A gentleman does his best"; Because of thinking about common sense, Einstein put forward the theory of relativity, and Bohr put forward quantum mechanics. For history, 30 years of reform and opening up, is it not because of thinking and changing ideology, and then the integration of knowledge and practice, which led to the rise of China today?

"Yihe Tiandi" has maintained an ancient civilization by virtue of common sense and walking with common sense. However, no matter in life or in development, you can't make progress without common sense.

Therefore, we might as well use Zi Si's "think carefully, distinguish clearly and act faithfully". For common sense, we should know, act and think, so that we can have a quiet life and keep moving forward.