What does it mean to be prepared for danger in times of peace and to avoid extravagance and become frugal?

Be prepared for danger in times of peace, abstain from extravagance and become frugal. On the surface, it means that when a person is relatively safe and comfortable, he should think about the dangers that may arise in the future, and Possible harm, then some protective measures must be taken appropriately. The following is to say that it is very difficult to quit the habit of luxury and enjoyment and enter the habit of thrift. These two sentences together actually mean the same thing. It means that if you want to be safe and comfortable, you must first have a certain sense of crisis. Only in this way can you maintain it for a long time. Once luxury becomes a habit, it will be difficult to cut it again. And once you have no money, If you want to be extravagant, it will be very difficult for you to be frugal because you are already used to a luxurious life. It can be said that the key point of this sentence is to cherish what you have in front of you, not to be too wasteful and extravagant, and to be moderate