Regarding this state of Buddhahood, it states: Its operation is nondual ("advaya vrtti") because of its abiding neither in samsara nor in nirvana ("samsaranirvana-apratisthitatvat"), through its being both conditioned and unconditioned ("samskrta-asamskrtatvena").This refers to the Yogācāra teaching that even though a Buddha has entered nirvana, they do no "abide" in some quiescent state separate from the world but continue to give rise to extensive activity on behalf of others.