Modern interpreters make seals and marks out as literal. They are compelled to frighten their audiences with tall tales of doom and judgement. Frighten people are more willing to buy books, CDs and download sermons, so they can better understand their future plight. However a quick study of these terms it is quite clear that they are all wholly spiritual. (See Also: Ex 13:16; Song 8:6; Ezek. 9:4, 6; John 6:27; Rom. 4:11; 1Cor. 9:2; 2Cor. 1:22; 2Tim. 2:19; Rev. 14:9, 11; 16:2; 19:20; 20:4)
Our seal is spiritual, in that only God knows who are his own.
In him you also, who have heard the word of truth, the gospel of your salvation, and have believed in him, were sealed with the promised Holy Spirit, Eph. 1:13
And do not grieve the Holy Spirit of God, in whom you were sealed for the day of redemption. Eph. 4:30
Our sealing is a promise that the day of redemption will come. A day when we will cast off our sin natures and physical bodies and become new spiritual beings.