But in the days of the voice of the seventh angel, when he shall begin to sound, the mystery of God should be finished, as he hath declared to his servants the prophets. (Revelation 10:7)
For comment on the word “mystery” see on Rev. 1:20; cf. on Rom. 11:25. Jesus used a similar phrase, “the mystery of the kingdom of God” (Mark 4:11), and Paul also speaks of “the mystery of God” (Col. 2:2) and “the mystery of Christ” (Col. 4:3). The mystery of God, that which He reveals to His children, is His purpose for them—the plan of redemption. Compare 1 Tim. 3:16; 6T 19.
The declaration and exposition of the mystery of God (see the foregoing on “the mystery of God”) has ever been the burden of His servants the prophets in their messages to men (see on Rom. 3:21).
When he shall begin.
Or, “when he shall sound.” The seventh trumpet marks a climactic point in the great controversy between Christ and Satan, as revealed by the proclamation of the voices in heaven at that time (ch. 11:15).
Some commentators have taken “days” here as prophetic year-days. Whether these are to be understood as days or years seems to make little difference, for the expression itself is general, and coming after the declaration of v. 6, they cannot specify a measurable time period (see on v. 6). The sense of the passage is that at the time of the seventh trumpet the mystery of God is to be completed. In God’s plan this event was to follow upon the proclamation that “there should be time no longer” (v. 6). Compare the declaration under the seventh plague, “It is done” (ch. 16:17).