George Bernard Shaw once said "Those who can, do; those who can't, teach" and has been widely used to suggest that teachers only do it because they are not good enough at their chosen profession. Anyone who has ever actually taught knows this to be false; teaching requires a very specialised skill set that very few truly possess. This is why we have a whole degree of Pedagogy of Languages dedicated to honing these skills to become the best at instilling information. Students learn aspects of language that would appear to have no practical use in the classroom, especially when teaching children.

However, Aristotle distinguishes between those who know the "why" (teachers/masters) and those who only know the "that" (experienced workers), stating that the ability to teach is a sign of true knowledge. Thus, as Lee Shulman states:

"Those who can, do; those who understand, teach"

I started teaching English kind of by accident, I spoke English, and there were language schools who preferred native speakers. I spent years learning to be a good teacher by taking advice and learning from more experienced non-native teachers who had actually learned the mechanics of a language I merely spoke. For many years, there were many questions asked by students that I just couldn’t answer, some new ones come up all the time. I am proud of myself for never pretending I knew something I didn’t, and still to this day I say to my students that I will come back to them on a point I can’t definitively answer. Teaching is the best thing I have ever done, and I love it when my students force me to better myself and continually extend myself. Welcome to the best job in the world.