Because for people, food is the most important thing. Only when they have enough food can they survive. Then we can talk about other things. The implication of this sentence is that when a person has enough strength, his heart will always be calm.
It can also be said that "there is food in your hand, but you don't panic in your heart." "From Mao Zedong's four-character poem" Grain in Hand ":If you have grain in your hand, don't panic in your heart. Down-to-earth, beaming probably means that with food, you are not afraid of starvation, and you have a bottom in your heart, and then you can do what you want to do. At the beginning of the founding of New China, Chairman Mao once said: Don't panic if you have food in your hand. Only at that time, it was mainly to solve the problem of food and clothing, and the slogan of "taking food as the key link" was put forward for a period of time.