In Zechariah 2:4, this signifies the church of people who will receive the Divine proceeding of the Lord on a deep level within themselves. (Apocalypse Explained 629[6])

284. The State of Peace in Heaven

Anyone who has not experienced heaven's peace cannot know what the peace is that angels enjoy. As long as we are in our bodies, we cannot accept heaven's peace, so we cannot perceive it, our perception being on the natural level. In order to perceive it, we need to be the kind of person who as to thought can be raised and taken out of the body and brought into the spirit so as to be with angels. Since I have perceived heaven's peace in this way, I can describe it, but not in words as it really is, because human words are not adequate. Using words, I can only describe what it is like compared to that peace of mind that people have who are content in God.