These kings have one purpose: to yield their power and authority to the beast.
Here we have the mystery of this vision explained. The apostle wonders at the sight of this woman: the angel undertakes to open this vision to him, it being the key of the former visions; and he tells the apostle what was meant by the beast on which the woman sat; but it is so explained as still to need further explanation. 1.
Commenting on Revelation 17:7-13
These have one mind,.... The princes of these kingdoms, and their subjects, become, in time, of one religion; first they were Arians, and then Papists; and for a long series of time there was great unity between them, with respect to religious sentiments, being zealously attached to the church of Rome, its principles and practices: and shall give their power and strength unto the beast...
Verse 13. These have one mind. That is, they are united in the promotion of the same object. Though in some respects wholly independent of each other, yet they may be regarded as, in fact, so far united that they tend to promote the same ultimate end.