Drink! for you know not whence you came nor why:
Drink! for you know not why you go, nor where.
Source: The Rub?iy?t of Omar Khayyam, st. 74, tr. by Edward FitzGerald, 1879.
-- Omar Khayyam, (May 18 1048-1131), Persian poet, mathematician, astronomer; He was renowned in his own country and time for his scientific achievements.