Art or Teaching? Can only an artist teach?

Art or Teaching...
I think as an art teacher it is important to have a balance of both your own art and teaching or your students work. I feel that it is important to still practice as an artist being a teacher but I do feel that the students come first. This is because as a teacher you choose to instruct your students on how to practice art and advise them. I feel that both could be done simultaneously but when it comes down to it the students outweigh your own work (during the school year).

Only artist can teach?
I don't think that you need to be an artist to be an art teacher. I feel this way because of a former basketball coach of mine. He was a 5'3" Asian American who never played organized basketball. He was one of the most intelligent coaches that I had and he has the accolades to back his coaching up. I do feel that this can overlap into all areas. Obviously there are some areas that it would be difficult to teach especially if you have never experienced what you are trying to teach. I don't think that everyone has the ability to do this but it can be done by a select few. I believe that having a passion and knowledge of the specific area is most important to be effective in teaching it.