Variantly: "And of the first of the mountains of yore and of the sweet things of the eternal hills" — (the first of) the blessings of the (fore-) fathers and mothers, who are called "mountains" and "hills," viz. (Song of Songs 4:6) "I will go to Mount Moriah and to the hill of frankincense"
(Devarim, Ibid. 16) "And of the sweet things of the earth and its fullness" — whereby we are taught that the land of Joseph is "full," and not lacking in any blessing. R. Shimon b. Yochai says: If a man anchors his boat in the portion of Joseph, he needs nothing outside of it.