Musar zu Ijow 23:13

I have already mentioned that just as G–d is unique, so is Israel unique, and that this is a reason why there is such a close relationship between G–d and Israel. It is the reason why כי לא יטוש ה' את עמו בעבור שמו הגדול, "that G–d will not abandon His people for the sake of His great Name" (Samuel I 12,22). The numerical value of G–d's Ineffable Name amounts to 26, twice the numerical value of אחד, "one", or 13. Israel's uniqueness added to G–d's uniqueness makes 26. If G–d were to abandon Israel, He would impair His "great Name." The means of the close relationship between G–d and Israel is the holy Torah, all of which is composed of letters in the name of G–d. Torah may be viewed as the revelation of G–d. By its observance of Torah, Israel "awakens" the spiritual dimensions of Torah, i.e. the mystique surrounding the various names of G–d. The result produced is that Israel literally "cleaves" to G–d. When we view the uniqueness of Jacob and the uniqueness of Joseph, we may also view each of them as בעלה של תורה, the master of Torah. Jacob is the proverbial איש תם יושב אהלים, whereas Joseph is the בן זקונים. Whatever Jacob had learned in the academy of Shem and Ever (after he left home and before he arrived at Laban's), he transmitted to his son Joseph.