When the sun is covered by clouds, objects are less conspicuous, because there is little difference between the light and shade of the trees and the buildings being illuminated by the brightness of the atmosphere which surrounds the objects in such a way that the shadows are few, and these few fade away so that their outline is lost in haze.
Leonardo da VinciThose who, in debate, appeal to their qualifications, argue from memory, not from understanding.
Leonardo da VinciGreat love is born of great knowledge of the thing that is loved, and if you do not know it, you can love it little or not at all.
Leonardo da VinciJust 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 Vinci