I see that the teacher who loves the subject matter is often found teaching and discussing it, whether being paid for it or not—even if he or she really needs the money. And this is doubly true of the teacher who also loves the students.
But the teacher who loves only the money—or perhaps, the prestige of being the teacher—tends to be stingy and personally disinterested in the subject, even a high expertise.
And the experience of the students, from the one teacher to the other, is like the difference between day and night.
