There is no such whetstone, to sharpen a good wit and encourage a will to learning, as is praise.
Quotes from The Schoolmaster — Roger Ascham
Attribution
Quotes and notes from Wikiquote: Roger Ascham (page history), available under CC BY-SA 4.0.
Quotes and notes from Wikiquote: Roger Ascham (page history), available under CC BY-SA 4.0.