Revelation 17:9
Good News Translation
"This calls for wisdom and understanding. The seven heads are seven hills, on which the woman sits. They are also seven kings:

New Revised Standard Version
“This calls for a mind that has wisdom: the seven heads are seven mountains on which the woman is seated; also, they are seven kings,

Contemporary English Version
Anyone with wisdom can figure this out. The seven heads that the woman is sitting on stand for seven hills. These heads are also seven kings.

New American Bible
Here is a clue for one who has wisdom. The seven heads represent seven hills upon which the woman sits. They also represent seven kings:

Douay-Rheims Bible
And here is the understanding that hath wisdom. The seven heads are seven mountains, upon which the woman sitteth: and they are seven kings.

Treasury of Scripture Knowledge

And here is the understanding that hath wisdom. The seven heads are seven mountains, upon which the woman sitteth: and they are seven kings.

here.

Revelation 13:18 Here is wisdom. He that hath understanding, let him count the number of the beast. For it is the number of a man: and the number of him is six hundred sixty-six.

Daniel 12:4,8-10 But thou, O Daniel, shut up the words, and seal the book, even to the time appointed: many shall pass over, and knowledge shall be manifold. . . .

Hosea 14:9 Who is wise, and he shall understand these things? prudent, and he shall know these things? for the ways of the Lord are right, and the just shall walk in them: but the transgressors shall fall in them.

Matthew 13:11 Who answered and said to them: Because to you it is given to know the mysteries of the kingdom of heaven: but to them it is not given.

Matthew 24:15 When therefore you shall see the abomination of desolation, which was spoken of by Daniel the prophet, standing in the holy place: he that readeth let him understand.

The seven.

Revelation 17:3,7,18 And he took me away in spirit into the desert. And I saw a woman sitting upon a scarlet coloured beast, full of names of blasphemy, having seven heads and ten horns. . . .

Revelation 13:1 And I saw a beast coming up out the sea, having seven heads and ten horns: and upon his horns, ten diadems: and upon his heads, names of blasphemy.

Context
The Mystery Explained
8The beast which thou sawest, was, and is not, and shall come up out of the bottomless pit and go into destruction. And the inhabitants on the earth (whose names are not written in the book of life from the foundation of the world) shall wonder, seeing the beast that was and is not. 9And here is the understanding that hath wisdom. The seven heads are seven mountains, upon which the woman sitteth: and they are seven kings. 10Five are fallen, one is, and the other is not yet come: and when he is come, he must remain a short time.…
Cross References
Revelation 13:18
Here is wisdom. He that hath understanding, let him count the number of the beast. For it is the number of a man: and the number of him is six hundred sixty-six.

Revelation 17:3
And he took me away in spirit into the desert. And I saw a woman sitting upon a scarlet coloured beast, full of names of blasphemy, having seven heads and ten horns.

Revelation 17:8
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