Life is so simple and beautiful

Life is so simple and beautiful; change your thinking and your life will change.
Das Leben ist so Einfach und schon —
Andere dein denken–und du Anderst dein Leben.

I found this quote in my notes. It’s about life, but I think it could also apply to teaching.
Teaching is so simple and beautiful; change your thinking and your teaching will change. Or perhaps, “change your thinking and your life has already changed” is more accurate?
(Unfortunately, I don’t remember where this quote came from, although I know I found it with the translation from the original German.)