Musar su Genesi 28:21

Jacob concluded his vow by saying: והיה ה' לי לאלוקים, "the Lord will be my G–d." We must remember that the vowel pattern used in the Ineffable Name of G–d is not uniform. The word appears with the vowel pattern Cholam Kametz, but it also appears with the same vowel pattern as the word Elo-him. When that is the case, though it appears with the latter vowel pattern we read it as if the word were in fact the name Elo-him. [This occurs frequently in the Books of the Prophets. Ed.] When pronounced in such a way, it refers to the name of G–d operative in the emanation בינה, as we have explained frequently. This principle has also been dealt with in Pardes Rimonim in the chapter called מהות והנהגה, sections six and seven. When the Ineffable Name is vocalized in the Cholam Kametz pattern it reflects G–d's activity in the emanation תפארת, the realm of His Sanctuary in the Heavens. The spiritual זווג, marital union between Jacob and Rachel is one that emanated in the emanation תפארת, whereas the זווג between Jacob and Leah originated in the higher emanation בינה. Jacob could not attain a real foothold in the emanation we earlier described as דעת, until Leah joined him in the lower emanation. In the future, Jacob will achieve a greater hold on the emanation בינה and דעת, that is what he alluded to when he said: והיה ה' לי לאלוקים.