Sine Qua Non of Mukti - Siva's Grace

The Ribhu Gita (ऋभुगीता) forms the sixth part of Siva Rahasya Purana. It details in about two thousand verses the dialogue on the Self and Brahman between Sage Ribhu (who in turn heard it from Lord Shiva Himself) and Sage Nidagha on the slopes of the Mount Kedara in the Himalayas. (source: wikipedia). 

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• That in which the whole universe is born and into which it is absorbed in dissolution, is the Siva-Self. Devoted worship of and meditation on that Siva-Self of pure Consciousness alone will attract Siva's Grace, which is indispensable for liberation.
• Those engaged in the pursuit of knowledge of Brahman-Self, happening to get involved in the mundane pleasures of sex, should regard such pleasures as merely faint shadows of the bliss of the Self. They should never even dream of worldly pleasures.
• As the Self is sat, meditative contact with the Self is the true sat-sanga (association with sadhus who abide in the Self). As Brahman-Self is the highest, association with the Self is Mahat Sanga (highest association).
• The sadhaka practising meditation on the Self, should always think firmly that all diversities of soul, world and creator are the undifferentiated Brahman Self only. By practice, his consciousness is freed from thoughts, after which he should give up the above thought also and abide always in the thought-free state of the Self.
• Abidance in the state of thought-free alert Awareness, is the state of mukti beyond thought and expression. The emergence of thought is the bondage of untold suffering. Abidance in the Self is the true non-dual samadhi, and that alone leads one to the eternal bliss of mukti.

From "The Essence of Ribhu Gita" by Prof. N. R. Krishnamurthi Aiyer