ACCORDING TO BIOGRAPHER WALTER ISAACSON, EINSTEIN WAS MORE INCLINED TO DENIGRATE ATHEISTS THAN RELIGIOUS PEOPLE.[24] EINSTEIN SAID IN CORRESPONDENCE, "[T]HE FANATICAL ATHEISTS...ARE LIKE SLAVES WHO ARE STILL FEELING THE WEIGHT OF THEIR CHAINS WHICH THEY HAVE THROWN OFF AFTER HARD STRUGGLE. THEY ARE CREATURES WHO—IN THEIR GRUDGE AGAINST THE TRADITIONAL 'OPIUM OF THE PEOPLE'—CANNOT HEAR THE MUSIC OF THE SPHERES."[24][25