First stage/turning of Buddhism: nirvana as the goal. Arhat. [[theravada]].
Second stage: nirvana and samsara joined. Non-dual. Bodhisattva. [[Nagarjuna]]. [[mahayana]
[[some rinpoche]]: The Bodhisattva vow is not about putting off enlightenment really; you need to know the destination to help others get it. The real point is to just not enter Nirvana and leave Samsara behind; rather to stay in a unified state to serve as a bridge.
Third stage accepts the second stage. Buddha nature is a wisdom mind, it is always present. Explores mind states more thoroughly. [[vajrana]].