One of the mysteries presented to the reader in the prelude to the Stormlight Archive is the nature of the Oathpact that is broken by the Heralds. A possible reason behind this pact occurred to me recently and it relates to a particular well known story from the Bible, the story of Job.
To those not familiar with said story:
Job is a very prosperous man who is both righteous and pious. God is very proud of Job but Satan claims that Job is only righteous because he is so sheltered. Satan wagers with God that if he were to take everything away from Job then he would not be so pious. God takes the wager and allows Satan to do what he wants short of taking Job's life. Satan tries everything but fails to get Job to curse God.
The possible parallel with the Oathpact lies in the deal between two deities with people caught in the middle.
In the Almighty's last message to Dalinar he says that it might be possible to get Odium to choose a champion. This implies that it is possible in some circumstances to make deals with Odium and so it might not be ridiculous to conjecture that deals have been struck in the past. There is also precedent for deals between two opposing Shards in Brandon's other Cosmere books.
If the Almighty is Honor as many suspect then maybe Honor and Odium made a wager on whether humans could be broken and made to discard their honor for selfish reasons. This would explain why the Heralds had to endure torment between desolations, this was a test of how long they could last.
Furthermore, if Honor and Odium made this deal then, presumably, a lot rode on the outcome. Possibly even the fate of the Shards and of Roshar itself. If this was the case then that would mean that 9 out of 10 Heralds forsaking the Oathpact would deal a crushing, possibly fatal, blow to Honor.
I have seen it noted that, curiously enough, the Heralds don't mention Honor and only mention the Almighty in passing. Comparing this to the story of Job then this might mean that the Heralds were unaware of this wager and only thought that they were defending humanity from the desolations when the real battle was for their virtue.
This only just occurred to me and I couldn't find any mention of this parallel being drawn anywhere so I decided to post it. I hope I'm not just reposting something that has already been discussed.