The True 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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• To hold on to the conviction born of Self-enquiry that "I am no doubt the Screen - Brahman-Self, and the world picture thereon, though evanescent, is no doubt 'I am Self' only", and to abide still and blissful in that conviction is the acme of all sadhanas, like divine worship, charitable gifts, spiritual austerities, mantra-japa and samadhi as well.
• The Self alone is the spontaneous self effulgent Awareness; that alone is eternal bliss; that alone is Existence everlasting; that alone is all embracing perfection, the sole Godhead without a rival and the sole primordial stuff of the Universe. In the conviction of this experience, one should ever abide, as the sole I AM, the Supreme Self.

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