Evidently the message was so awesome that man could not handle it. It is sealed and is never revealed in this book. The Lord will evidently explain and reveal this Himself when we are with Him. From the nature of the passage, or context, this apparently deals with God's judgments and purposes for these things, but the details are sealed. The feet firmly planted adds a determined and emphatic note to this affirmation of what God is going to do.
Modern man derides both.
Instead of being the creation of a personal God who created mankind for His own glory and purposes, man is the impersonal result of time and chance. Some see this as a declaration that time will be no more. Verse 7 explains this and makes the concept clear. When the seventh angel sounds, then the mystery of God will be finished , there will be no more delay, time will have run out. The answer to this is found in Scripture.