Jamieson, Fausset and Brown on Ephesians 2:14

14. he--Greek, "Himself" alone, pre-eminently, and none else. Emphatical.

our peace--not merely "Peacemaker," but "Himself" the price of our (Jews' and Gentiles' alike) peace with God, and so the bond of union between "both" in God. He took both into Himself, and reconciled them, united, to God, by His assuming our nature and our penal and legal liabilities (Ep 2:15; Is 9:5, 6; 53:5; Mi 5:5; Col 1:20). His title, "Shiloh," means the same (Ge 49:10).

the middle wall of partition--Greek, "... of the partition" or "fence"; the middle wall which parted Jew and Gentile. There was a balustrade of stone which separated the court of the Gentiles from the holy place, which it was death for a Gentile to pass. But this, though incidentally alluded to, was but a symbol of the partition itself, namely, "the enmity" between "both" and God (Ep 2:15), the real cause of separation from God, and so the mediate cause of their separation from one another. Hence there was a twofold wall of partition, one the inner wall, severing the Jewish people from entrance to the holy part of the temple where the priests officiated, the other the outer wall, separating the Gentile proselytes from access to the court of the Jews (compare Eze 44:7; Ac 21:28). Thus this twofold wall represented the Sinaitic law, which both severed all men, even the Jews, from access to God (through sin, which is the violation of the law), and also separated the Gentiles from the Jews. As the term "wall" implies the strength of the partition, so "fence" implies that it was easily removed by God when the due time came.