1. If young people don’t work hard, old people will be sad.

From "Long Song Xing" in "Yuefu Poetry Collection"

2. People who have no long-term worries must have immediate worries.

From "The Analects of Confucius_Wei Linggong".

It means that if there is no long-term plan, then there will be a lot of worries about recent things. It can be understood that if people have no long-term considerations, then the worries must be close at hand.

3. Before the soldiers and horses move, food and grass go first.

From: "Expedition in the Forest". It means that the troops and horses have not moved. Food and fodder first means that the food and fodder should be prepared before sending troops.

Metaphor before doing something.

4. Everything will be successful if it is foreseen, otherwise it will be ruined.

From "Book of Rites· Doctrine of the Mean". Whatever you do, if you plan and prepare in advance, you will succeed, otherwise you will fail.

5. Rather than looking at the fish in the abyss, it is better to retreat and build a net.

It means that if you stand by the water and want to catch fish, it is better to go home and build a net. It is a metaphor that only wishes without measures will do nothing good for things.