Tweet Where there is shouting, there is no true knowledge. Quote by Leonardo da Vinci. You May Also Like...There is only one good, knowledge, and one evil, ignorance.One can have no smaller or greater mastery than mastery of oneself.The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge.Wisdom is the daughter of experience.My brain is only a receiver, in the Universe there is a core from which we obtain knowledge, strength and inspiration. I have not penetrated into the secrets of this core, but I know that it exists.The most important knowledge is that which guides the way you lead your life.I have been impressed with the urgency of doing. Knowing is not enough, we must apply. Being willing is not enough, we must do.If you can't explain it to a six year old, you don't understand it yourself.Why does the eye see a thing more clearly in dreams than the imagination when awake?