Quitting klonopin is a very stressful thing to do, so if you start again, and have to quit again, you have to go through the stress that puts on the body again. Also, long-term use of benzos is thought by many researchers to permanently affect adversely the brain's ability to adapt to stress, so if that's true, that's another strike against going back on a drug that is addictive and very hard to stop taking.