Talmud Shabbos 31a(1) - 31a(3):1-27 - "One should always strive to be humble and gentle in his ways like Hillel, and let one not be stern and unyielding like Shammai." "The sterness of Shammai sought to banish us from the world of true devotion to G-d, but the humble manner of Hillel brought us under the wings of the Divine Presence".