Tweet I have been impressed with the urgency of doing. Knowing is not enough, we must apply. Being willing is not enough, we must do. Quote by Leonardo da Vinci. You May Also Like...Action is the foundational key to all success.Wisdom is the daughter of experience.Happiness is not something ready made. It comes from your own actions.Where there is shouting, there is no true knowledge.Realize that everything connects to everything else.Be not afraid of growing slowly, be afraid only of standing still.The noblest pleasure is the joy of understanding.Do more than just exist.Either write something worth reading or do something worth writing.