A teacher is never a giver of truth. A teacher is a guide, a pointer to the truth that each student must find for themselves. A good teacher is merely a catalyst.
There are two things I don't understand enough but somehow don't like: 1. Cryptocurrency, and 2. The phenomenon that many people I know in the United States hate Facebook. Therefore, this semester I enrolled in a Blockchain course and a Tech, Media & Democracy course to try to understand how these two things I'm not too fond of work and see whether I can change my mind after learning these. So far, I'm still not convinced, but I have a lot of fun learning these.
In some senses, I took these classes as almost merely a motivation for me to learn because I might not want to spend time on these otherwise. This struck me to think about what Bruce Lee said about teachers.
We can learn almost everything online. Therefore, I started to believe that a teacher, or even a course in my case, should not be the source of knowledge but the way to gain knowledge. The difference might seem subtle, but it is like we should treat it as a means, not an end. (as opposed to what Immanuel Kant said, rational human beings should be treated as an end in themselves and not as a means to something else.)
Therefore, a teacher is merely a catalyst. We still have to learn the stuff by ourselves, and teachers can only support and motivate us.