Just as iron rusts from disuse, and stagnant water putrefies, or when cold turns to ice, so our intellect wastes unless it is kept in use.
Leonardo da VinciA good memory, which nature has endowed us with, causes things long past to seem present.
Leonardo da VinciPainting is concerned with the ten things you can see: these are darkness and brightness, substance and color, form and place, remoteness and nearness, movement and rest.
Leonardo da Vinci