Grindelwald knew

I don’t know how many times I’ve listened to the books now…but it just struck me…when Grindelwald tells Voldemort, “There is so much you do not understand”…that he probably knows why he was sought out, and possibly even the allegiance of the Elder Wand. I forgot he was a damn Seer…he probably could have even known that it would eventually be allied to Harry and that Voldemort would lose in the end.