Rav Yehudah said in the name of Rav, “The explicit Name of Hashem, which contains forty-two letters, is revealed only to one who is modest and humble, and has reached half his years [at least 35 years old], and who never gets angry, and who never gets drunk, and who overlooks slights and who does not demand his fair due. Anyone who knows the Name, is careful with it, and guards it in purity, is beloved above and desirable below, and his awe is found on all creatures, and he inherits two worlds—this world and the World to Come.” (Kiddushin 71a)
