Sahaja Nishta (Sahaja Samadhi)

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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• Mind merged completely in the Self, one becomes a lord without rival - steeped in bliss beyond compare. In that state one should abide still, free from the least trace of thought.
• I am that Self which is integral existence awareness-bliss, the sole impartite Brahman-Self. Firm in the conviction born of this experience, one should abide still, free from the least trace of thought.
• In the conviction that 'I am the Self' in which no thought, ego, desire, mind or confusion can exist one should abide still, free from trace of thought.
• The firm faith of being the Self is sufficient to dispel all thought and establish one in Brahman-Self. In due course of this practice, even the thought involved in that faith fades away leading to the spontaneous effulgence of the Self. If a person hearkens to this teaching and practises the faith, even if he is a great sinner, he is washed clean of all his sins and is established in Brahman-Self.
• There is certainly no such thing as mind with its constituents of thought and thought forms of objects. In this conviction one should ever abide still and at peace, in the state of thought-free alert Awareness-self which endures after all sadhanas and its rigours have exhausted themselves in Brahman-Self.
• Having gained the experience that there is no creator, no maya, no duality, and no objects at all, and that pure Awareness-Self alone exists, one should ever remain still and peaceful in that state of Selfhood.
• If a person gives heed to these teachings he would certainly gain the grace of Lord Shiva and attain the state of Selfhood even though he is immersed in the dense darkness of nescience which could not be banished by the glare of a million suns.

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

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From Srimad Bhagavad Gita:

In this path of Yoga (path of Knowledge), no effort is lost due to incompleteness and no contrary effect of an adverse nature is produced due to failures. Even a little observance of this discipline saves one from great fear.

Even if you happen to be the worst of sinners, you will surely go across all sin by the raft of divine knowledge.