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Dravyasamgraha Acārya Umasvami’s Tattvārthasūtra
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(9-27)
Concentration of thought on one particular object is meditation. In the case of a person with the best physical structure or constitution it extends up to one muhūrta.
Ācārya Pujyapada's Sarvārthasiddhi The first three physical structures? are included here. Meditation is possible for the individuals possessing these three physical structures. But salvation is possible only for the ascetic with the first physical structure. He who has the best physical structure is the agent. 'Ekāgra' means having one point, edge or object. Thought is characterized by throbbing or quivering, as it embraces several objects. Concentration is turning the thought away from several objects and fixing it on one. By this the nature of meditation has been described. 'Muhurta' is the period of time. 'Antarmuhurta' means within one muhūrta. The time limit is within one muhūrta. It is not possible to maintain concentration beyond that.
Knowledge which shines without quivering like the steady flame of a candle is meditation.
Jain, S.A., Reality, p. 266-267.
The name-karma on the rise of which different types of joints of the bones are effected, is the name-karma of joints. It is of six kinds: the perfect joint noted for extraordinary sturdiness and strength (vajrarsabhanārācasamhanana), the less perfect joint (vajranārācasamhanana), the still inferior joint (nārācasamhanana), the weak joint (ardhanārācasamhanana), the very weak joint (kilikāsamhanana), and utterly weak joint (asamprāptāsripātikāsamhanana).
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