An astrologer, having entered his own house, saw a stranger and, getting angry, began to insult him, whereon both fell upon each other and fought so that turmoil and confusion ensued. A pious man who had the scene exclaimed: <br /> <br /> ‘How knowest thou what is in the zenith of the sky <br /> If thou art not aware who is in thy house?’<br /><br />Saadi Shirazi<br /><br />http://www.poemhunter.com/poem/ch-04-on-the-advantages-of-silence-story-11/