The text on the back of the way of kings reads
"I long for the days before the Last Desolation.
The age before the Heralds abandoned us and the Knights Radiant turned against us. A time when there was still magic in the world and honor in the hearts of men.
The world became ours, and we lost it. Nothing, it appears, is more challenging to the souls of men than victory itself.
Or was that victory an illusion all along? Did our enemies realize that the harder they fought, the stronger we resisted? Perhaps they saw that the heat and the hammer only make for a better grade of sword. But ignore the steel long enough, and it will eventually rust away.
There are four whom we watch. The first is the surgeon, forced to put aside healing to become a soldier in the most brutal war of our time. The second is the assassin, a murderer who weeps as he kills. The third is the liar, a young woman who wears a scholar’s mantle over the heart of a thief. The last is the highprince, a warlord whose eyes have opened to the past as his thirst for battle wanes.
The world can change. Surgebinding and Shardwielding can return; the magics of ancient days can become ours again. These four people are key.
One of them may redeem us
And one of them will destroy us"
I haven't seen much discussion about this, and it seems relevant to WaT. It claims that Kaladin, Szeth, Shallan, or Dalinar is going to destroy "us", the sleepless. I don't know if they are referring to themselves specifically or if they think that Roshar is going to be destroyed.
Personally, I don't Kaladin is the destroyer, as he is a good person and doesn't want to fight anymore. He seems more likely to be the possible redeemer. Shallan is set up to become a part of the greater Cosmere, and I don't think she'll do anything to destroy Roshar, fighting the Ghostbloods could have unanticipated consequences.
Dalinar and Szeth are the most likely in my opinion, as Dalinar has the contest with Odium, which, based on other theories, isn't going to end well for him. Szeth is unstable, has nightblood and it's his book. He is very capable of destroying things.
Anyways, thoughts, questions, opinions?