Omar Khayyám: Quatrains

As far as you can avoid it, do not give grief to anyone. Never inflict your rage on another. If you hope for eternal rest, feel the pain yourself; but don’t hurt others.” Omar Khayyam – عمر خیّام‎‎  (18 May 1048 – 4 December 1131) was a Persian mathematician, astronomer, and poet.