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:
‘How knowest thou what is in the zenith of the sky
If thou art not aware who is in thy house?’
Saadi Shirazi
http://www.poemhunter.com/poem/ch-04-on-the-advantages-of-silence-story-11/
