Imagine the characters in Lord of the Rings exercising their imaginations about how Sauron could be defeated.
NONE of them would have guessed correctly how it would all go down. It's easy to see in hindsight, but before it happens, it's absolutely unthinkable. "Two hobbits will sneak the One Ring in to Mordor, even to the fires of Mount Doom, and because of their pity for a fallen hobbit (Smeagol), the One Ring will be destroyed and Sauron utterly defeated."
Once again, Tolkien was tapped into a Catholic way of thinking. And that example (from fiction) is very realistic in how unpredictable it was, and how it went so far beyond "the counsels of the wise". Think of how all the men, elves and dwarves were thinking in terms of armies and warfare -- and all the while, that was completely the wrong path and would never succeed.
A student of history would recognize this same kind of thing happening out here in the real world, in the pages of history. Just for starters: Our Lord defeating satan in a very unexpected way on Calvary. Again: Tolkien was a Catholic. He didn't just make up these supremely realistic themes. They're right from God's imagination into our own reality, our own history.