Rev 13:16 And he causeth all, both small and great, rich and poor, free and bond, to receive a mark in their right hand, or in their foreheads:
Rev 13:17 And that no man might buy or sell, save he that had the mark, or the name of the beast, or the number of his name.
Rev 13:18 Here is wisdom. Let him that hath understanding count the number of the beast: for it is the number of a man; and his number is Six hundred threescore and six.(666)
In one of messages of the Virgin Mary given to Don Stefano Gobbi, of the Marian Movement of Priests, we can read: "333 indicated once, that is to say, for the first time, expresses the mystery of the unity of God. 333 indicated twice, that is to say, for the second time, indicates the two natures, that of the divine and the human, united in the divine Person of Jesus Christ, 333 indicated thrice, that is to say, for the third time, indicates the mystery of the Three Divine Persons, that is to say, it expresses the mystery of the Most Holy Trinity. Thus the number, 333, expressed one, two and three times, expresses the principal mysteries of the Catholic faith which are: (1) The Unity and the Trinity of God, (2) the incarnation, the passion and death, and the resurrection of our Lord Jesus Christ."
BH