What does the altar of Revelation 16: 7 symbolize?

And I heard another out of the altar say, Even so, Lord God Almighty, true and righteous are thy judgments. Revelation 16:7 - King James

 

⚪ The Great Pyramid

Rev. 16 [...] 16:7. And I heard [another out of] the altar. — The "Altar to the Lord in the midst of the land of Egypt" (Isa.19:19) at the time these plagues are being poured out upon the antitypical Egyptians, is the Great Pyramid, discussed in a separate section of Volume III. Source : 🇺🇸 1917 - Studies in the Scriptures, Vol 7, The finished mystery, page 240 + Cover

 

⚫ All who are in God's sacrificial arrangement

Rev. 16 [...] God's altar therefore approves of the deadly punishment administered to and upon the wilfully wicked "goat" class, and all who are in God's sacrificial arrangement or covenant likewise approve. Therefore it is written: "And I heard another out of the altar say, Even so, Lord God Almighty, true and righteous are thy judgments."- Vs. 7. Source : 🇺🇸 1930 - Light, Vol 2, page 28 + Cover