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...Yesterday is gone. Tomorrow has not yet come. We have only today. Let us begin.One can have no smaller or greater mastery than mastery of oneself.The future depends on what you do today.Where there is shouting, there is no true knowledge.Good actions give strength to ourselves and inspire good actions in others.Do what you can, with what you have, where you are.The man who does not read has no advantage over the man who cannot read.Do more than just exist.Either write something worth reading or do something worth writing.