It is not too late to remedy the situation. Don't be self-reliant when you are young, don't give up on yourself when you are old, etc.

It’s not too late to remedy the situation: this is a fable. It is a metaphor for promptly remedying a mistake to avoid greater losses. Used in learning, it means that if you have not studied well in the past, you suddenly wake up and want to learn, then it is still too late to act immediately.

Don’t be self-reliant when you are young, and don’t give up on yourself when you are old: The author of this sentence is Feng Menglong, which means that you should not think that you are too young to be self-reliant because you have more time and do not study hard, nor should you think that you will be good when you are old. Give up on yourself and give up on learning. The intention is to remind you that it is never too late to learn.