"The thing of greatest importance here is the awful fact that, before ever man’s HAND was extended and the transgression committed, that old serpent, the king of the bestial system, the devil, had IMPARTED HIS MIND TO THEM. The MARK OF THE BEAST was in their hearts, in their MINDS, and in their FOREHEADS, and what they did afterward was the MARK OF THE BEAST in their HANDS. It is not difficult to see that the things which men are doing today and have done in ages past are but the MANIFESTATION of that which is in their minds, for, “As a man THINKS in his heart, so is he” (Prov. 23:7) and “a good man out of the good treasure of the heart brings forth good things; and an evil man out of the evil treasure brings forth evil things” (Mat. 12:34-35). The mark of the beast that appears IN THE HAND (outward actions) is the direct result of the mark of the beast IN THE FOREHEAD (mind, nature). This is the mind that inspires the ever increasing confusion and violence that is running rampant among all nations."
In depth study on the mark in the link:
https://www.kingdombiblestudies.org/antichrist/antichrist1.htm#6
.
"Revelation, chapters thirteen and fourteen belong to each other and should be read and studied together. The neglect of this principle has caused much mischief in modern times. If many present day writers and preachers had set THE MARK OF THE BEAST of chapter thirteen against THE MARK OF THE FATHER’S NAME on the foreheads of the saints described in chapter fourteen, we would have had less of frightful and ghastly events so confidently foretold in books and pamphlets so readily devoured by precious Christians highly susceptible to prophetic sensationalism."
"To him that overcomes will I grant to sit with Me in My throne, even as I also overcame, and am set down with My Father in His throne” (Rev. 3:21)"
"These are they of whom it is written, “And I looked, and lo, a Lamb stood on mount Zion, and with Him an hundred forty and four thousand, having HIS FATHER’S NAME WRITTEN IN THEIR FOREHEADS,” in distinction to those who, in Rev. 13:16 take “the mark of the beast”. The mark of the beast denotes that those who bear it have been filled with the nature, spirit, ways, doctrines and idolatry of the bestial system. Therefore the mark which these 144,000 bear denotes that they are not defiled with the bestial spirit and shame and are in every respect cleansed, perfected, and made partakers of the Father’s nature. I have no ability to believe that the Father’s name in the forehead is anything more or less than the MIND OF CHRIST. Though we read many explanations of the mark of the beast, it is my conviction that it would be safe to lay them all aside in the understanding that the MARK OF THE BEAST is nothing more or less than the mind of the serpent in man. The carnal mind, which is everywhere evident in the religious systems, as in government, commerce, and every other institution spawned by man, is the enemy of God and had its beginning with the serpent in Eden. Neither the divine mark nor the devil’s mark can be a visible thing. Both are symbols bespeaking a nature POSSESSING THE MIND and in turn MANIFESTING THROUGH THE OUTWARD ACTIONS of men."