It's really pleasing to see one of your students really learning and asking questions.

I have one student who comes in everyday and she asks questions. She sincerely wants to learn, not to just know, but to better herself. She wants to get a decent job, so she not only comes to learn, but she also tries to comport herself in a professional manner.

Students like these make the teaching experience fell "nice", but they're not the ones that make you feel fulfilled. It's the students who think they can't learn, or that they're wasting time, that really challenge you. Getting one of these students to "see", to understand the material, that's what makes you feel like a teacher. That's when you understand why people become teachers for crappy pay.