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Yoga-drishti-samuccaya
It is kept above. Its shadow falls on it, and it attains the state of being like that, the state of being like that. Just as a pure mind-jewel meditates, its shadow falls on it, and it attains the state of being like that, the state of being like that, due to the influence of the object being contemplated. Thus, just like a pure crystal gem, those with a subtle mind (1) attain it through 'tārthya', i.e., with unwavering focus, and (2) through 'tad-janapana', i.e., with complete absorption, like the application of collyrium.
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Samapatti
There are three main essential conditions for this samapatti to occur: (1) First, the mind must be pure, like a crystal gem, with a subtle mind. This is the qualification for attaining samapatti. (2) Just like a crystal placed near a flower, the mind must be steadily focused on the object being contemplated. If this is not the case, how can samapatti occur? (3) And then, just as the color of the flower falls on the crystal, there must be complete absorption, the object of meditation must be firmly imprinted in the mind. Only when this happens does samapatti occur. Also, these three conditions (Essential conditions) that are essential for samapatti to occur, the previous one is the cause of the next. Because first of all, the essence of the mind must be extremely pure, like a crystal, i.e., the mind must become extremely sattvic. If this does not happen, just as the shadow of a flower does not fall on a stone, so too, the shadow of the object worthy of contemplation does not fall on a polluted mind, samapatti does not occur. But when the mind becomes pure, subtle, transparent, like a crystal, it does not run towards other thoughts. Due to this, it becomes steady and attains focus; and when it attains this focus, it then attains complete absorption. The meaning is that when the mind becomes pure, it becomes steady, and when it becomes steady, it becomes absorbed. Thus, the beginning of samapatti
X "मणिरिवाभिजातस्य क्षीणवृत्तेरसंशयम् ।
તાન્ધ્યાત્ત કારત્વાષ સમાઽત્ત: કથીર્ત્તિતા ૫ શ્રી યશા. કૃત દ્વા॰ દ્વા૦ ૨, ૧૦
* According to the terminology of Patanjali's Yoga Shastra, there are three types of samapatti: grahya, grahana, and grihita. Of these, grahya samapatti is the state of being absorbed in nivichara samadhi, grahana samapatti is the state of being absorbed in sananda samadhi, and grihita samapatti is the state of being absorbed in sasmita samadhi. There are also four types of samapatti: (1) savit, (2) nirvit, (3) savichara, (4) nivichara. This samapatti is called saprajnat samadhi (savikalpa), and it is also called 'sakhij' samadhi. In this, the last nivichara samapatti, when it is immersed, leads to spiritual grace, which gives rise to a knowledge that is greater than shruti and anumana. This knowledge gives rise to tattva-sanskara, which is the destroyer of the karmic residues, and its cessation gives rise to samadhi called asamprajnat (nivikalpa). Through the study of the virama suffix and the remnants of the sanskara of 'naiti neti', this asamprajnat samadhi reveals the true nature of the self, the state of being established in its own form. Thus, nivichara samapatti - spiritual grace → knowledge → tattva-sanskara → asamprajnat samadhi → kaivalya, - this is the order. (For more details, see Patanjali, and Yashvijayji's Dva. Kru. 20).