Well I can't say it's my "favorite" but one that has come up in my life from others?
"Let God be God".
Kind of rolls along with the verse about the creation not saying to the creator "what doest thou"
But the verse doesn't say that you "should" not...it says that it "does not" which to me says says something a little deeper. I digress. Either way, I get impatient in my understanding unto error at times and it has been helpful.