This proverb means or suggests that there is not limit in life. No matter how intelligent or wise you are, you still have to learn more to be more intelligent. No matter how rich you are, you can work even harder to earn more money and acquire more possession.
No matter how intelligent you are at school, you should not be overtaken by complacency; rather, learn even harder to improve on your performance and remain the best. When you relax, other will kick your ass, and you would lose your position.
The big economies such as USA, China, Japan, Germany, etc., are never complacent; hence, they have not stopped growing. Rather, they are ever growing, bringing new inventions, ideas, institutions, machines, policies, etc., to ensure they grow even more.
