A.T. Robertson Commentary Revelation 7:12

"saying, Amen: Blessing, and glory, and wisdom, and thanksgiving, and honor, and power, and might, [be] unto our God for ever and ever. Amen." — Revelation 7:12 (ASV)

Note αμην at the beginning and the close of the doxology. Note also separate feminine article with each of the seven attributes given God, as in 4:11; 5:12,13.