Quote authors Leonardo da Vinci Quotes new popular alphabet 6 Found: 0 Nature never breaks her own laws. Leonardo da Vinci I have been impressed with the urgency of doing. Knowing is not enough; we must apply. Being willing is not enough; we must do. Leonardo da Vinci Wisdom is the daughter of experience. Leonardo da Vinci There are three classes of people: those who see. Those who see when they are shown. Those who do not see. Leonardo da Vinci The greatest deception men suffer is from their own opinions. Leonardo da Vinci Simplicity is the ultimate sophistication. Leonardo da Vinci 1 - 6