Lost my dad when I was only 7 so don't remember any memorable sayings from him, but here's one I picked up from somewhere that my kids got tired of hearing from me,
"If you've got time to do it over, then you had time to do it right the first time."
Here's another one, "Put it away, in your room...where I want it to be, not where you think it should be."
That was specifically directed to my son who, when I told him to put something in his room, usually put it on the floor just inside the doorway to his room.