Those with wisdom (who are now having ears to hear) are commanded to calculate the number of the Beast. The number is the number of a man (6) and it provides the identifying attributes of the kingdom of the Beast as it plays out in the physical realm of humanity. Combined, 666 equals perfect incompletion; it will never be enough, the Beast will never be enough.
The Calculation from the Codex examples of 666:
1) Religion and the religious traditions of men (the apostasy of Cain expressed in the lust of the flesh): 6
2) Great wealth garnished from the peddling of its religious traditions and from its authoritative rule through the religions of man (the apostasy of Balaam expressed in the lust of the eyes): 6.
3) Authority, rule, kingship, governmental power (the apostasy of Korah expressed in the boastful pride of life): 6
With his attachment to power, control, religion, and wealth, the Beast takes his authority (his seat) from within the household of God (the Sanctuary being the body of Christ) and uses the religion of Christianity (Mystery Babylon) to garnish for himself the worship of man.