קבלה אויף בראשית 27:29

Again, “he who is lightly esteemed” is exemplified in Jacob, who humbled himself before Esau so that the latter should in time become his servant, in fulfilment of the blessing: “Let people serve thee, and nations bow down to thee, etc.” (Gen. 27, 29). For Jacob’s time had not yet arrived, as he deferred it to the future, and in the immediate present he “esteemed himself lightly”. But in the proper time “he that playeth the man of rank” will become the servant to him “that lacketh bread”, to the man who was allotted “plenty of corn and wine” (Ibid. 28).

However, no deed is done by the Lord but has its reason and its justice; and as in all other cases, so also in this. He to whom the Holy One has given a wife, and who has generated with her, is not like others who undergo transmigration. One who in this world truly and humbly endeavoured to make the tree fruitful, but who did not succeed in his attempt, is not to be placed in the same category with one who consciously and wilfully refused the duty of engendering children, so uprooting the tree, scattering its leaves, and wasting its fruit.