"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
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"My deep and earnest prayer is that the Lord shall give all His elect understanding, that they may be flooded with His light, and in His light see their Owner, and His crib, and Him that has purchased them, even the heavenly Man, the firstborn Son, the forerunner who for us has entered in beyond the veil. And is it not fit, O man, that the heavenly Man should have them whom He purchases, and has paid a price for them, at His service, and to be at His ordering and rule, and to live unto Him, and do His will, and not at the command and order of the bestial system of this world, be it political, economic, or ecclesiastical? My ransomed spirit shouts, Amen!"