BG 6.12

There, one should sit in a firm and comfortable position and practice yoga by controlling the mind and senses, purifying the heart, and fixing the mind on one point.

6.12. Sitting there on the seat and making the mind single-pointed, let him, with the activities of his mind and senses subdued, practise Yoga for self-purification.

6.12 Seated thus, his mind concentrated, its functions controlled and his senses governed, let him practise meditation for the purification of his lower nature.

6.12 See Comment under 6.15

6.11 - 6.12 'In a clean spot,' i.e., in a spot pure in itself, not owned or controlled by impure persons and untouched by impure things; having 'established a firm seat,' a seat made of wood or similar material, which is neither too high nor too low; which is covered with cloth, deer-skin and Kusa grass in the reverse order; seated on it in a way which promotes the serenity of mind; having the mind concentrated on Yoga; and holding the activities of the mind and senses in check in all ways - he should practise 'Yoga', i.e., practise the vision of the self for 'the purification of the self,' i.e., to end his bondage.

6.12 Pratisthapya, having established; sthiram, firmly; sucau, in a clean; dese, place, which is solitary, either naturally or through improvement; atmanah, his own; asanam, seat; na ati ucchritam, neither too high; na ati nicam, nor even too low; and that made of caila-ajina-kusa-uttram, cloth, skin, and kusa-grass, placed successively one below the other-the successive arrangement of cloth etc. here is in a reverse order to that of the textual reading-. What follows after thus establishing the seat? Upavisya, sitting; tatra, on that; asane, seat; yogam yunjyat, he should concentrate his mind. To what purpose should he concentrate his mind? In answer the Lord says: atma-visuddhaye, for the purification of the internal organ. How? Krtva, making; manah, the mind; ekagram, one-pointed,by withdrawing it from all objects; and yata-citta-indriya-kriyah, keeping the actions (kriyah) of the mind (citta) and senses (indriya) under control (yata). The external seat has been spoken of. Now is being stated how the posture of the body should be:

6.12 There, sitting on the seat, with the mind concentrated and holding the mind and senses in check, he should practise Yoga for the purification of the self.

6.12 (and) sitting on that seat, he should concentrate his mind for the purification of the internal organ, making the mind one-pointed and keeping the actions of the mind and senses under control.