Happy Teachers' Day!

I got a card from the authority. Usually I'd throw it into the can even without skimming the content. Then, I'd talk to myself why not save the money and do something meaningful. This year at this moment, however, I was exhausted to focus on real stuff, so I read the card for pleasure. Accidentally, I found I was impressed by two lines below that I'd like to share with you all here.
講台上、書桌旁，不變的是我的身影；
吵雜中、喧嚷時，不變的是我的熱情。