“I learned failure early and mastered it.”

“There is the greatest practical benefit in making a few failures early in life.”

“For a great master, everyone is a master, because he learns from everyone! For a great master, everything is a master, because he learns from everything!”

“What the world calls failure, I call learning.”

“First, not a word more from you about the past. There was an error in your calculations. I know what that is. It affects the whole machine, and failure is the consequence. You will profit by the failure, and will avoid it another time. I have done a similar thing myself, in construction, often. Every failure teaches a man something, if he will learn; and you are too sensible a man not to learn from this failure.”

“Snape replied pointedly, “I learned when not to talk from the master, Albus.”