1. What a great man says is not necessarily right, and what a great man does is not necessarily right. Only practice can produce true knowledge.

Feng Zikai, a cartoonist, once drew a picture of selling sheep: a farmer took two sheep and sold them to his boss in a sheep shed. After reading it, an old man shook his head and said with a smile, "Draw an extra rope." Feng Zikai looked at his painting carefully: "Two ropes affect two sheep. Where is the rope? "

At this time, the farmer told him: "You only need to pull the first sheep, no matter how many, as long as one rope is enough." Feng Zikai was amazed after listening.

You see, it is because of a painting that the cartoonist bowed to the peasants, and the peasants did such a thing. You can tell at a glance. Where's Feng Zikai?

Because I don't understand this, I take it for granted that two sheep have to pull two ropes. I think if this painting is not seen by farmers, but by other literati, then the mistake will not necessarily be found. Where's Feng Zikai? I will definitely make similar mistakes in the future.

2. No matter how rich a person's knowledge is, he knows astronomy above and geography below. If he lacks practice, he can only wait and die, and can't do great things.

We are no strangers to the battle of Changping in history. It is a great tragedy that Zhao's 400,000 troops were buried alive by Qin. The reason is just that Zhao Kuo, an armchair strategist, left regrets in history. If Zhao Wang is good at employing people and replaces Zhao Kuo with Lian Po, I think history will be rewritten.

This is a lesson of blood, we should always keep it in mind and always tell ourselves to be good at practice.