Actually, we feel lazy when we are stuck with something. I remember a time when I was a child, I have so much energy, I can run, jump, walk and it seemed that it was unlimited sources. I went to school and then I've realized that my mind started to watch television, or find some ways on how to avoid studying. But there were subjects that I liked so much, I came home, started to do some stuff and then learned it. And the teacher was really strict, but I love them. I did my job done, and now I think about it with gratitude and it is awesome.
And if we talk about laziness, we need to say about the lack of energy from a lot of teachers. It is a truth that children feel it. How do we can change that? Just simple, simplify learning and gives techniques that helped to feel confident in studying and give time for learning, as indeed it is not easy to focus on, you need this energy.
Show how to learn, but not talk about it. As indeed human beings are awesome creatures, they can be good at a lot of things, we only need to realize that everything takes time. That's why you cannot be good at everything, but you can be good at something.