Two kinds of gratitude:
The sudden kind we feel for what we take;
the larger kind we feel for what we give.
-- Edwin Arlington Robinson (1869-1935)
In the process of learning, we are grateful to those who teach us.
Try teaching some one, and you will be grateful for such an opportunity that helps you think about how others learn.
The teaching experience will enrich your own learning and you will learn from how your "student" learn!