Revelation 13:18

For the sober-minded, time and experience will reveal the actual significance of the number and the truth of whatever has been written about it. For, were it necessary, as some of the teachers say, that such a name be clearly known, the seer would have revealed it. But the divine grace did not consent that the name of the destroyer be noted in the divine book.

Here is wisdom. Let him who has understanding, etc. This number is said to be found among the Greeks in the name Titan, that is, giant, as follows: Τ equals 300, Ε equals 5, Ι equals 10, Τ equals 300, Α equals 1, Ν equals 50. It is thought that the Antichrist will assume this name as if he surpasses all in power, boasting that he is the one of whom it is written: He rejoiced as a giant to run his course, from one end of the heaven is his going forth, etc. (Psalm XVIII). Primasius also mentions another name that completes the same number: Α equals 1, Ν equals 50, Τ equals 300, Ε equals 5, Μ equals 40, Ο equals 70, Σ equals 200, which signifies "contrary to honor." Also, the word Α equals 1, Ρ equals 100, Ν equals 50, Ο equals 70, Υ equals 400, Μ equals 40, Ε equals 5, meaning "I deny." Through these, the quality of the person and the harshness of the Antichrist's work are indicated. However, a complex exposition is needed to explain how such an aspirant to praise would want to be marked with such a character. Otherwise, who does not know that the number six, by which the world was made, signifies the perfection of the work? Whether simple, or multiplied by ten or a hundred, it demonstrates the perfection of the sixtieth and the hundredfold fruit. Moreover, the weight of gold that came to Solomon each year was six hundred sixty-six talents. Therefore, what is rightly owed and paid as tribute to the true king, that same tribute the deceiving tyrant will presume to demand.

"His number is the name of a man, and his number is Six hundred threescore and six." As they have it reckoned from the Greek characters, they thus find it among many to be teitan, for teitanhas this number, which the Gentiles call Sol and Phoebus; and it is reckoned in Greek thus: t three hundred, e five, i ten, t three hundred, a one, n fifty,-which taken together become six hundred and sixty-six. For as far as belongs to the Greek letters, they fill up this number and name; which name if you wish to turn into Latin, it is understood by the antiphrase Diclux, which letters are reckoned in this manner: since D figures five hundred, I one, C a hundred, L fifty, V five, X ten,-which by the reckoning up of the letters makes similarly six hundred and sixty-six, that is, what in Greek gives teitan, to wit, what in Latin is called Diclux; by which name, expressed by anti-phrases, we understand Antichrist, who, although he be cut off from the supernal light, and deprived thereof, yet transforms himself into an angel of light, daring to call himself light. Moreover, we find in a certain Greek codex antemoj, which letters being reckoned up, you will find to give the number as above: a one, n fifty, t three hundred, e five, m forty, o seventy, j two hundred,-which together makes six hundred and sixty-six, according to the Greeks. Moreover, there is another name in Gothic of him, which will be evident of itself, that is, genshrikoj, which in the same way you will reckon in Greek letters: g three, e five, n fifty, j two hundred, h eight, r a hundred, i ten, k twenty, o seventy, j also two hundred, which, as has been said above, make six hundred and sixty-six.