Is attaining the permanent state of Nirbikalpa Samadhi (Nivikalapa or Nirbeej Samadhi) necessary for a soul to attain Liberation/Moksha?
In Adi Shankara’s vivekachudamani he seems to be indicating very clearly that unless one unites one’s soul with spirit in samadhi, there is no question of moksha.
However, in the Bhagavad Gita Lord Krishna in several places indicates several ways by which we can reach him and he does not seem to insist on Nirbikalpa Samadhi for Moksha.
—Hitesh Khiani, India
According to Paramhansa Yogananda, nirbikalpa samadhi is indeed a necessary step toward the higher state of moksha (liberation). I suspect that Sri Krishna does not elaborate on samadhi states in the Gita because he is emphasizing the things we need to do in order to approach samadhi. First things first!
But do not be discouraged, for we do not know what states we have already obtained in past lives. Yoganandaji asked one of his most advanced disciples, when she was on her deathbed, if she had any last wish. When she asked for samadhi, he told her that she was beyond that. And yet, advanced as she was, she didn’t know! I find that very encouraging.
In any case, Hitesh, all we can do is keep meditating and leave the results in God’s hands.