Kabbalah Mazmur 51:20: Zohar

The text continues: “If his master have given him a wife, and she have borne him sons or daughters, the wife and her children shall be her master’s, and he shall go out by himself.” “His master” is “the Lord of the whole earth”; “have given him a wife”: from this we learn that it is not in the discretion of man himself to take a wife, but that all things have to be “laid in the balance” (Ps. 62, 10)..And who is the woman whom the Master gives him in this case? One who was not actually intended to be his wife, but the wife of another whom he managed to anticipate in God’s good graces, and his Master permitted him to have her because He foresaw that she would bear him children.

He to whom the Master gave a wife in order that he might generate children did after all endeavour to enrich the tree, though he did not succeed. The Holy One, therefore, knowing his good intention, has pity on him and, after first collecting His own due, and taking what the fount formerly failed to produce, permits him to start anew, and labour for himself in order to make good his deficiency. In addition it must be remembered that the man has to undergo transmigration because he is not, in any case, of great merit: since if he were so he would not have had to pass into another form and live again upon the earth, but would at once have “a place better than sons and daughters”. ‘So much, then, for the mysteries contained in this verse.