Have you noticed that when we eat a whole bunch of candy before lunch, we lose our appetite and don't want to eat real food? And real food is what makes us grow! The Bible says that sometimes we think we already know everything and don't want to learn new things anymore. We get full and reject the good things.
But the child who wants to be the best at what they do is always hungry to learn! They know that sometimes studying or putting away toys feels a little bitter and boring in the moment, but they do it happily, because they know it's going to make them so much stronger and smarter in the end!