Kabbalah zu Tehillim 4:6

"He called Esau his eldest son..." This means that he was included within strict Judgment. "And he said, Behold now, I am old, I know not the day of my death." Rabbi Elazar opened the discussion with the verse, "Happy is the man, whose strength is in You..." (Tehilim 84:6), happy is the man who is strengthened by the Holy One, blessed be He, and puts his trust in Him.