Rav Yehudah said in the name of Rav:--The Divine name, which consists of
forty-two letters, is revealed only to him who is prudent and meek, who
has reached the meridian of life, is not prone to wrath, not given to
drink, and not revengeful. He that knows that name, and acts
circumspectly in regard to it, and retains it sacredly, is beloved in
heaven and esteemed on earth; He inspires men with reverence, and is
heir both to the world that now is and that which is to come.
THE TALMUD, _Kiddushin_, fol. 71, col. 1.