I make sure that the following points are conveyed to the students on the very first lecture of a course.
Please don't consider me as a Guru, one among the so-called Mata-Pita-Guru-Daivam quadruplet. Just consider me as a fellow human trying to help you learn, who has better experience and knowledge than you in the subject.
Learning is a slow and continuous process. Don't misunderstand that you can learn a whole one-semester course by reading the notes at the end of the semester. Attending classes regularly is the most important part of learning. In my case, skipping a few classes will result in a poor understanding of the stuff in later classes. Because, I plan and teach, and I very well remember the things that I have already discussed in the class, and hence I may refer to ideas discussed in previous classes.
There are many resources available online. You can even find recordings of lectures by excellent teachers from around the world. Therefore, attending my lectures is completely optional. If you think that you can spend the time reserved for my class on some other better stuff, then you're free to bunk my class, provided the college authority does not have mandatory attendance rules. The essence is that you should learn, not necessarily from me.
Learning a subject means learning the techniques in the subject. Each area of math has completely different techniques. You can't get familiar with that by reading notes or books, which usually does not point it out in contrast to a good teacher. And, for the same reason, working out proofs is far more important than learning the results.
You will learn some things with better understanding from your peers than from a teacher. It is very important to keep discussing the subject with a few of your classmates throughout the course. It is advised to formally form a group of 3-4 students who are ready to discuss, and schedule timing for the discussion sessions. It will be great if you can meet at least 3-4 times a week.