He denied personal immortality, and worshiped reason alone. He appears to have had no sexual life, existed austerely, and sensibly allowed his most important writings, including the "Ethics," only a posthumous publication. As a teacher of reality, he practiced his own wisdom, and was surely one of the most exemplary human beings ever to have lived. He troubles me most by his extraordinary autonomy, all but unique in that Jewish history of which he did not desire to be a participant, in any way whatsoever.