"You can be a giant among artists without ever attaining any great skill. Facility is a dangerous thing. When there is too much technical ease the brain stops criticizing. Don't let the hand fall into a smart way of putting the mind to sleep."

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I know very well that because I am unlettered some presumptuous people will think they have the right to criticize me, saying that I am an uncultured man. What stupid fools! Do they not know that I could reply to them as Marius did to the Roman patricians: "Do those who pride themselves on the works of other men claim to challenge mine?

— Leonardo da Vinci