One of the teachers on the college I went to had a note on his door with "If you understand everything you're doing - you're not learning anything.
From the hilarious "There are 3 ways to learn. (Knowledge Fight Animated)"
https://www.youtube.com/watch?v=NsqZZiWDHAQ
https://www.iheart.com/podcast/105-behind-the-bastards-29236...
One of the teachers on the college I went to had a note on his door with "If you understand everything you're doing - you're not learning anything.