This quote is from The Revelation of *Immanuel-Christ-Jesus; and is only speaking to - a small Group: about - a small Group. In other words, this is serious meat, that is Not for everyone. *I.C.J. is LIGHT and in HIM there is no - Darkness, at all[1Jn.1:5]. We as followers must illuminate our surroundings as well.
In the Garden we see Christ-Jesus as the Tree of Life: He shows up many times throughout Part-1 of the Bible. He takes up residence with man, with items from an Offering in Ex.25, beginning from the inside 1/3[Sanctuary] to the outer 2/3[Tabernacle, and Ark]. This moved, until King Solomon built a Temple.
Temple - a Sacred, dwelling place for our Creator. Followers must know the difference between a Temple of GOD, Vs. a Synagogue! In Rev.2:, and 3:9 the only two Churches that knew the "Key of David" and knew the entire Truth = which made them free. Over time the word Sanctuary became interchangeable with Temple; which is extremely important knowledge.
John the Baptist, Immanuel-Christ-Jesus, His Disciples, and Followers are to teach "Repent: for the Kingdom of Heaven is at hand." Immanuel brought it[Kingdom] with Him, and made it available "to whosoever will." The Kingdom is inside of us[Luke 17:21, 1Cor.3:16,17] at the intersection of our Eyes, and Ears = the Sanctuary/Temple of GOD.
The exact same as above, occurs for the king-of-chaos, His children[Tares], and their deceived-followers. A Synagogue = an assembly of ....: the building where .... assemblies are held. Over the past 2,015 yrs. this Synagogue is between the eyes and ears of two or more like-minded Followers-of-Satan. As in Jer.24 the "evil-figs" are immediately known: always, look at the Fruit!