A man saw a large sword which another one wore at his side. Said he “Poor fellow, for a long time I have seen you tied to that weapon; why do you not release yourself as your hands are untied, and set yourself free?” To which the other replied: “This is none of yours, on the contrary it is an old story.” The former speaker, feeling stung, replied: “I know that you are acquainted with so few things in this world, that I thought anything I could tell you would be new to you.”
Taken from The Notebooks of Leonardo da Vinci edited by Jean Paul Richter, 1880.