Revelation 17:9

Here is scope for the exercise of a mind that has wisdom! The seven heads are the seven hills on which the woman sits.

Revelation 13:18

Here is scope for ingenuity. Let people of shrewd intelligence calculate the number of the Wild Beast; for it indicates a certain man, and his number is 666.

Revelation 17:3

So he carried me away in the Spirit into a desert, and there I saw a woman sitting on a scarlet-colored Wild Beast which was covered with names of blasphemy and had seven heads and ten horns.

Matthew 13:11

"Because," He replied, "while to you it is granted to know the secrets of the Kingdom of the Heavens, to them it is not.

Matthew 24:15

"When you have seen (to use the language of the Prophet Daniel)

Revelation 13:1

And he took up a position upon the sands of the sea-shore. Then I saw a Wild Beast coming up out of the sea, and he had ten horns and seven heads. On his horns were ten kingly crowns, and inscribed on his heads were names full of blasphemy.

Revelation 17:7

Then the angel said to me, "Why are you so astonished? I will explain to you the secret meaning of the woman and of the seven-headed, ten-horned Wild Beast which carries her.

Revelation 17:18

And the woman whom you have seen is the great city which has kingly power over the kings of the earth."

Treasury of Scripture Knowledge

Summary

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

Bible References

Here

Revelation 13:18
Here is scope for ingenuity. Let people of shrewd intelligence calculate the number of the Wild Beast; for it indicates a certain man, and his number is 666.
Matthew 13:11
"Because," He replied, "while to you it is granted to know the secrets of the Kingdom of the Heavens, to them it is not.
Matthew 24:15
"When you have seen (to use the language of the Prophet Daniel)

The seven

Revelation 17:3
So he carried me away in the Spirit into a desert, and there I saw a woman sitting on a scarlet-colored Wild Beast which was covered with names of blasphemy and had seven heads and ten horns.
Revelation 13:1
And he took up a position upon the sands of the sea-shore. Then I saw a Wild Beast coming up out of the sea, and he had ten horns and seven heads. On his horns were ten kingly crowns, and inscribed on his heads were names full of blasphemy.