The Sages of the Zohar asked Rabbi Shimon Bar Yohai , Why did Jacob withhold giving Esau some lentil stew until he had sold him the birthright? The unspoken question is "Is that the way a righteous man behaves?!" Rabbi Shimon Bar Yohai 's answer, was decisive. Jacob was a righteous man of truth who is incapable of deceiving anyone. What was this truth of Yaakov and how does it affect us till this day?