Even we have seen some people have huge potential in their work. They are on top, and we gave them Oscar or Nobel laureates.
For them, they consider there is still room improvement. They think that we never reach perfection, we just have to improve better and better every day. The mantra is there is no perfection. If you take an influential person, they improve themselves and teach us (to society). They are still looking for a better option, even in apps, there is an update moreover every week. They are making better.
They know that learning is the never-ending process. They invest in learning and get back a huge dividend. Their mantra is there is still room for improvement.