1. Teachers are not always as confident or prepared as they may look.
2. Even when my students don't necessarily tell me what's wrong, I can tell if they are having a problem in their lives because it affects their performance in the class. A lot of times people's performance will be affected by outside circumstances that have little to do with their motivation, study habits, or intelligence.
3. I am surprised how sometimes students will share very personal details of their lives with me, things that, if it were me, I wouldn't tell someone that I didn't know that well. I appreciate their trust.
4. It's not that you are being sneaky and getting away with passing notes or sending text messages in class without us knowing about it. We know about it. We just decided not to do anything about it at the time.