how knowledge goes to end

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Patanjali called it as nirbija samadhi. Advaita Vedanta calls it as turiyatita, the state after the 4th state (turiya). Jean Dun edited a book by Nisargadatta titled ‘Prior to Consciousness’. Unfortunately Sri Ramana doesn’t tell much about turiyatita, but if you read the Annamalai Swami’s reports, you will find Sri Ramana often entered deepest nirbija samadhis.