“The angel whom I saw standing on the sea and on the land raised up his hand to heaven and swore by Him who lives forever and ever, who created heaven and the things that are in it, the earth and the things that are in it, and the sea and the things that are in it, that there should be delay no longer, but in the days of the sounding of the seventh angel, when he is about to sound, the mystery of God would be finished, as He declared to His servants the prophets.” Revelation 10:5-7 nkjv

The angel raising up his hand to heaven means taking an oath, like mentioned in Daniel 12:7, recognizing the authority and power that exists within and proclaiming his name. God’s mighty plan is going to be fulfilled and also the mystery of God would be finished. We will know the mystery of God until everything will be finished. So, if you encounter any of those who profess to know the future through prophecy, you need to seriously be skeptical and question the authenticity. Because, here, we know for fact, that only God knows.