I believe that these two phrases in Rev 13, and again in 17 link, (connect these two chapters together). It tells us what wisdom is, and then lets us know a mind that has wisdom can add these together and you come up with the number of the beast while following Satan's M.O. at the same time. Wisdom is simple!

Rev 13:18

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.

Rev 17:

9 And here is the mind which hath wisdom. The seven heads are seven mountains, on which the woman sitteth.

15

10 And there are seven kings: five are fallen, and one is, and the other is not yet come; and when he cometh, he must continue a short space.

14

11 And the beast that was, and is not, even he is the eighth, and is of the seven, and goeth into perdition.

15

12 And the ten horns which thou sawest are ten kings, which have received no kingdom as yet; but receive power as kings one hour with the beast.

21

13 These have one mind, and shall give their power and strength unto the beast.

1

14 These shall make war with the Lamb, and the Lamb shall overcome them: for he is Lord of lords, and King of kings: and they that are with him are called, and chosen, and faithful. Warfare

600

TTL=666