The story of one who had a little knowledge

A certain man knew something of astronomy and his head, in consequence, was filled with pride. Journeying far, he visited Kushyar, their sage, who turned his eyes from him and would teach him nothing. When the dissapointed traveler was on the point of leaving, Kushyar addressed him with these words:

"Thou imaginest that thou art full of knowledge. How can a vessel that is full received more? Rid thyself of thy pretensions, so that thou mayest be filled. Being full of vanity, thou goest empty."

- The Bostan of Saadi