I watched as he opened the sixth seal. There was a great earthquake. The sun turned black like sackcloth made of goat hair, the whole moon turned blood red, 13 and the stars in the sky fell to earth, as figs drop from a fig tree when shaken by a strong wind. 14 The heavens receded like a scroll being rolled up, and every mountain and island was removed from its place.
15 Then the kings of the earth, the princes, the generals, the rich, the mighty, and everyone else, both slave and free, hid in caves and among the rocks of the mountains. 16 They called to the mountains and the rocks, “Fall on us and hide us[f] from the face of him who sits on the throne and from the wrath of the Lamb! 17 For the great day of their[g] wrath has come, and who can withstand it?” (Revelation 6:12-18)
In this passage we find something strange: everyone in the world is afraid of the wrath of a Lamb? A lamb is a weak, gentle, defenseless animal that can hardly protect itself, let alone terrorize other creatures. But this Lamb is also the Lion of Judah, the powerful King who will one day rule the world in justice (Revelation 5:5). This lamb has teeth!
When Jesus came to Earth the first time human beings saw Him as a lamb and only as a lamb. They saw him as being defenseless and vulnerable. In the end the Jews and Gentiles collaberated to have Him killed. At the time God tolerated it because of His love for the human race. He wanted to give us all time to repent of our sins.
But when Jesus comes back the second time the time for toleration will be over. This time the “lamb” will terrify them, because they will recognize Him not only as the one true God, but as the one true God whom they mistreated and abused when He made Himself appear vulnerable among them. They will be scared, not just because of His power, but also because of their own obvious guilt.