purpose of prophecy

In reading Isaiah today, I came across this verse:

"Therefore I told you these things long ago; before they happened I announced them to you so that you could not say, 'My idols did them; my wooden image and metal god ordained them'" (Isaiah 48:5).

I think this is so cool! God's ways and purposes are so amazing and transcend anything we would ever think of. According to this passage, God revealed certain happenings to His people before they occurred for the express purpose that they would know that it was He who did it, not their idols. He made it known before it happened; He performed it. Idols made of wood and stone could not take the credit.