What does Edgar plan to do-and what is his state of mind?

Unfairly convicted, Edgar has everything good in his life taken away. He's stripped of his identity and forced into the lowest possible social position. He ends up witnessing most of the horrible events of King Lear, and is always the guy to pull a "things can't possibly get any worse!" right before they do. Yet Edgar perseveres through hard work, determination, and a reliance on Shakespeare's carefully orchestrated coincidences. Of course, survival wouldn't be nearly so important if it didn't mean he got to take revenge at the end of it.