Andrew of Caesarea
Although what the saints saw, the altar, the censer, and the rest, is depicted here in material form and colored in various ways, all this is invisible and spiritual. The Angel stands before the altar and holds the censer with frankincense. Like incense, He offers to God the prayers of the saints. In these prayers they ask that, for the calamities at the end of the world, the torments of the impious and lawless in the age to come may be eased. They also ask that the Lord, by His coming, may reward those who have labored. This is said further on as well.
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"And much incense was given to Him, that He might place it, with the prayers of all the saints, upon the golden altar before the throne." The golden altar, on which every holy ministering power finds its foundation and where the sacrifices of the martyrs are offered, is Christ Himself. The altar shown to Moses on the mountain with the tabernacle served as His type (Ex 25:9; Heb 8:5). The incenses, as has been said, signify the prayers of the saints, fragrant before God. "Before the throne" means before the highest heavenly powers. Into them have been poured divine fiery love, and pure and infinite wisdom and understanding. This is indicated by the meaning of the names of the higher powers that draw near to God.