Apocalypse Revealed #172
172. "And to the angel of the church in Philadelphia write." (3:7) This symbolically means, to people and concerning people who are governed by truths springing from goodness derived from the Lord.
That these are meant by the church in Philadelphia is apparent from the particulars written to it, understood in their spiritual sense.
Revelation 15:3
3
They sang the song of Moses, the servant of God, and the song of the Lamb, saying, "Great and marvelous are your works, Lord God, the Almighty! Righteous and true are your ways, you King of the nations.