6. “Iron sharpeneth iron; so a man sharpeneth the countenance of his friend,” says the book of Proverbs,(1013) and the sages derive from this verse the doctrine that learning does not thrive in solitude.(1014) A single log does not nourish the flame; to keep up the fire one must throw in one piece of wood after the other. This applies also to learning; it lacks in vigor, if it is not communicated to others. Wisdom calls to her votaries on the highways, in order that the stream of knowledge may overflow for many. For both the culture of the intellect and the ennobling of the soul it is necessary that man should step out of the narrow limits of self and come into touch with a larger world. Only in devotion to his fellows is man made to realize his own godlike nature. In the same measure as he honors God’s image in others, in foe as well as in friend, in the most lowly servant as well in the most noble master, man increases his own dignity. This is the fundamental thought of morality as expressed in Job, especially in the beautiful thirty-first chapter, and as embodied in Abraham,(1015) and later reflected in various Talmudic sayings about the dignity of man.(1016) Everywhere man’s relation to society becomes a test of his own worth. The idea of interdependence and reciprocal duty among all members of the human family forms the outstanding characteristic of Jewish ethics. For it is far more concerned in the welfare of society than in that of the individual, and demands that those endowed with fortune should care for the unfortunate, the strong for the weak, and those blessed with vision for the blind. As God Himself is Father to the fatherless, Judge of the widows, and Protector of the oppressed, so should man be. “Works of benevolence form the beginning and the end of the Torah,” points out R. Simlai.(1017)