If you can stop the dukkha, then you can create nirvana. And that means once you've reached nirvana, you don't have to keep coming back to this miserable place. Because the idea is when you want something, when you need something, that creates karma. And that karma is what keeps you trapped in this reincarnation cycle. So that's the third noble truth, is realizing that you have to stop all of this madness. And the fourth noble truth is magga. And magga means that there is a pathway to doing this.