I agree with most of what Ephod says in this thread.
The mark of the beast is the reverse to the SEAL of God, which is the Holy Spirit (2 Cor. 1:22; Eph. 1:13; Eph. 4:30).
Revelation 14:9-11 describes the punishment for those who receive the mark of the beast - eternal torment with no rest, day or night.
Revelation 14:12 says: "Here is the paitience and the faith of the saints; here are those who keep the commandments of God and the faith of Jesus."
Thus, you cannot have the mark of the beast and at the same time keep God's commandments and have faith in Christ. These are contrary to one another.
In the Old Testament, God told the Jews to bind the Law of Moses "as a sign on your hand and as frontlets between your eyes" (Exodus 13:16). Orthodox Jews and Rabbis in Israel, to this day, when they pray, wear a little black box with a rolled up piece of paper with the 10 commandments in it between their eyes, and they wrap a black cord around their right hand a certain number of times for certain laws of Moses.
What John saw here was the whole entire world, besides the saints, taking up a NEW kind of law - a law dedicated to the worship and service of Satan. Worship for the forehead and service for the right hand.
As far as "buying and selling", I do not believe this refers to individual transactions, say, at a grocery store or a laundr-o-mat. If this were the case, then how would it be determined when there are machines all over the place where you can simply put in a dollar and get out a coke. Is that not an example of buying something?
James 4:13 says, "Come now, you who say, "Today or tomorrow we will go to such and such a city, spend a year there, buy and sell, and make a profit..."
In the days of the early church, when John wrote the book of Revelation, people made their living and money from "buying and selling" things. Lydia, in Acts, for example, was a "seller of purple [cloth]." They were merchants who made their living by buying and selling - it was their WORK.
I believe Satan will infiltrate the workplace of anywhere in the world to the extent that if you go and get a job, to sell your time to them for money, that they will make you blaspheme God and His Spirit and thus worship the devil and be brought into spiritual bondage to the "beast," which I believe is a demon, not a man. Just my opinion.
If you read Revelation 13 closely, you will see that God provides a way for you to know whether or not you have received the mark of the beast or not. He says in verse 10, "He who lead into captivity shall go into captivity, and he who kills with the sword must be killed with the the sword. Here is the patience and the faith of the saints."
I believe that the mark is basically learning ways to help the devil capture souls and then trying to capture souls and bring them into captivity. Those who learn these ways and set them before themselves constantly (as much as a Jew would put before him the Law of Moses - God's commands and Jesus' faith) and lead others into worship and slavery to the beast, will suffer eternal torment and have their part in the lake of fire which burns forever with fire and brimstone.
Does anyone else agree?