Mbh 12.317.1c

Thus merging these one after another, Yogins contemplate the Supreme Soul which is One, which is freed from Rajas, which is stainless, which is Immutable and Infinite and Pure and without defect, who is Eternal Purusha, who is unchangeable, who is Indivisible, who is without decay and death, who is everlasting, who transcends diminution, and which is Immutable Brahma. Listen now, O monarch, to the indications of one that is in Yoga. All the indications of cheerful contentment that are his who is slumbering in contentment are seen in the person, that is in Samadhi. The person in Samadhi, the wise say, looks like the fixed and upward flame of a lamp that is full of oil and that burns in a breezeless spot. He is like a rock which is incapable of being moved in the slightest degree by ever a heavy downpour from the clouds. He is incapable of being moved by the din of conches and drums, or by songs or the sound of hundreds of musical instruments beat or blown together. Even this is the indication of one in Samadhi. As a man of cool courage and determination, while ascending a flight of steps with a vessel full of oil in his hands, does not spill even a drop of the liquid if frightened and threatened by persons armed with weapons even so the Yogin, when his mind has been concentrated and when he beholds the Supreme Soul in Samadhi, does not, in consequence of the entire stoppage of the functions of his senses at such a time, move in the slightest degree. Even these should be known to be the indication of the Yogin while he is in Samadhi. While in Samadhi, the Yogin beholds Brahma which is Supreme and Immutable, and which is situated like a blazing Effulgence in the midst of thick Darkness. It is by this means that he attains, after many years, to Emancipation after casting off this inanimate body. Even this is what the eternal Sruti declares. This is called the Yoga of the Yogins. What else is it?