3:7 But when he saw many of the Pharisees and Sadducees come to his baptism, he said unto them, O generation of vipers, who hath warned you to flee from the wrath to come?

Matthew 3:7

C.H. Spurgeon writes:

T is pleasant to pass over a country after a storm has spent itself; to smell the freshness of the herbs after the rain has passed away, and to note the drops while they glisten like purest diamonds in the sunlight. That is the position of a Christian. He is going through a land where the storm has spent itself upon His Saviour's head, and if there be a few drops of sorrow falling, they distil from clouds of mercy, and Jesus cheers him by the assurance that they are not for his destruction. But how terrible is it to witness the approach of a tempest: to note the forewarnings of the storm; to mark the birds of heaven as they droop their wings; to see the cattle as they lay their heads low in terror; to discern the face of the sky as it groweth black, and look to the sun which shineth not, and the heavens which are angry and frowning! How terrible to await the dread advance of a hurricane—such as occurs, sometimes, in the tropics—to wait in terrible apprehension till the wind shall rush forth in fury, tearing up trees from their roots, forcing rocks from their pedestals, and hurling down all the dwelling-places of man! And yet, sinner, this is your present position. No hot drops have as yet fallen, but a shower of fire is coming. No terrible winds howl around you, but God's tempest is gathering its dread artillery. As yet the water-floods are dammed up by mercy, but the flood-gates shall soon be opened: the thunderbolts of God are yet in His storehouse, but lo! the tempest hastens, and how awful shall that moment be when God, robed in vengeance, shall march forth in fury! Where, where, where, O sinner, wilt thou hide thy head, or whither wilt thou flee? O that the hand of mercy may now lead you to Christ! He is freely set before you in the gospel: His riven side is the rock of shelter. Thou knowest thy need of Him; believe in Him, cast thyself upon Him, and then the fury shall be overpast for ever.

I remember as a child knowing I had been caught doing something I wasn't supposed to do and waiting for the punishment with dread.  What was about to come for my childish transgression was nothing in comparison to what waits for the unsaved.