Discourses, "To or Against a Person Who Was One of Those Who Were Not Valued Esteemed by Him" (§2)

“Why then do you say nothing to me? I can only say this to you, that he who knows not who he is, and for what purpose he exists, and what is this world, and with whom he is associated, and what things are the good and the bad, and the beautiful and the ugly, and who neither understands discourse nor demonstration, nor what is true nor what is false, and who is not able to distinguish them, will neither desire according to nature nor turn away nor move towards, nor intend (to act), nor assent, nor dissent, nor suspend his judgment: to say all in a few words, he will go about dumb and blind, thinking that he is somebody, but being nobody.”