A literal mark on the forehead or right hand.What is the mark of the beast?
Romans 1:28 KJV
And even as they did not like to retain God in their knowledge, God gave them over to a reprobate mind, to do those things which are not convenient;
These God gave over to their corruption.
2 Thessalonians 2:10-12 KJV
10) And with all deceivableness of unrighteousness in them that perish; because they received not the love of the truth, that they might be saved.
11) And for this cause God shall send them strong delusion, that they should believe a lie:
12) That they all might be damned who believed not the truth, but had pleasure in unrighteousness.
In these, God will specifically mess with their minds so they won't be able to think right. Strong delusion is literally a working of error. And to the purpose that they will be condemned. No turning back.
John 12:37-41 KJV
37) But though he had done so many miracles before them, yet they believed not on him:
38) That the saying of Esaias the prophet might be fulfilled, which he spake, Lord, who hath believed our report? and to whom hath the arm of the Lord been revealed?
39) Therefore they could not believe, because that Esaias said again,
40) He hath blinded their eyes, and hardened their heart; that they should not see with their eyes, nor understand with their heart, and be converted, and I should heal them.
41) These things said Esaias, when he saw his glory, and spake of him.
Revelation 14:9-11 KJV
9) And the third angel followed them, saying with a loud voice, If any man worship the beast and his image, and receive his mark in his forehead, or in his hand,
10) The same shall drink of the wine of the wrath of God, which is poured out without mixture into the cup of his indignation; and he shall be tormented with fire and brimstone in the presence of the holy angels, and in the presence of the Lamb:
11) And the smoke of their torment ascendeth up for ever and ever: and they have no rest day nor night, who worship the beast and his image, and whosoever receiveth the mark of his name.
The people will be warned, they will not be ignorant. Though this will not be an easy thing.
Like CS Lewis remarked, when the director walks out on the stage, it means the show is over. Jesus is coming. The people of the world have to give a final answer. For those who think to delay, they will find themselves in front of the image of the beast, commanded to worship it, or face death. Those who worship will be marked, and let go, their final answer a living death into eternal death. Those who refuse will be killed, entering into eternal life.
Much love!