Teaching any subject has a funny way of educating the teacher at least as much as the student.
— Chris Birk
How I Became a Better Writer Thanks to Distracted, Hungover College Kids
We all know it already, but I like the way he said it, and the blog post is worth reading. I wish this guy was teaching my college kids. Heck, my college kids wish he was teaching them — or at least, they wish that their teachers valued tight writing and would “coat undergraduate papers in ink.”
Denise Gaskins' Let's Play Math 
This is so true! I think we will grow and excel as teachers when we realize that we are not perfect and we have “arrived.” It is important for teachers to be ever learning. I know when we show humility in this way we grow closer to our students too.