Ephesians says Christ “has broken down in his flesh the dividing wall of hostility.” It explains this as abolishing “the law of commandments expressed in ordinances” to create “one new man” and reconcile both to God. See Ephesians 2:14–16.
In Ephesians 2:13–18, the writer turns from “once” to “now”: people formerly “far off” are brought “near” through Christ’s blood. Christ himself is described as “our peace,” because he makes two groups into one by breaking down what separated them. This section sits inside a larger movement in chapter 2 that contrasts past and present. Earlier, the writer describes a former condition of death and distance, then a new situation brought about by God’s action in Christ (Eph.2.1-Eph.2.10).
The passage presents a clear “then vs. now” change: people who were “far off” are now “near,” and the stated means is “the blood of Christ” (verse 13). The text’s focus is not only personal closeness to God but the ending of a real separation between “both” groups (verses 14–16).
A careful answer keeps the immediate passage, the book's argument, and the whole-Bible storyline together, so the question is answered in context instead of as a detached idea.
Start with Ephesians 2:14-16, then read the surrounding section so the answer stays connected to the passage's flow.
14For he is our peace, who made both one, and broke down the middle wall of partition,
15having abolished in the flesh the hostility, the law of commandments contained in ordinances, that he might create in himself one new man of the two, making peace;
16and might reconcile them both in one body to God through the cross, having killed the hostility thereby.