BG 6.15

Thus practicing constant control of the body, mind and activities, the mystic transcendentalist, his mind regulated, attains to the kingdom of God [or the abode of Kṛṣṇa] by cessation of material existence.

6.15. Yoking his self (mind) incessantly in this manner, My devotee, with mind not attached to anything else, realises peace which culminates in the nirvana and is in the form of ending in Me.

6.15 Thus keeping his mind always in communion with Me, and with his thoughts subdued, he shall attain that Peace which is mine and which will lead him to liberation at last.

6.10-15 Yogi etc. upto adhigacchati. Self : the mind. Let him yoke it : let him make it single-pointed. Always : not for a limited period of time. If the conditions like remaining alone etc., are fulfilled, this [controlling of mind] is possible and not otherwise. On account of the firmness of seat, the time-nerve (or the body ?) remains firm and due to this, mind remains firm. He, by whom the mental activities i.e., those that are in the form of intention, and other activities of the sense-organs are subdued i.e., are brought under full control; [he is the person of the subdued mental and sensual activities]. Holding : i.e., with effort. If the nose-tip is looked at, [it is possible] not to look at [different] directions. Let him remain endowed with the state of having Me alone as supreme goal. This is the meaning [here]. He who yokes i.e., concentrates his self (mind) in this manner, there arises for him Peace in which the culmination - as far as the end-is the same as attaining Me.

6.15 'Ever applying his mind on Me,' i.e., the Supreme Brahman, the Supreme Person and the holy and auspicious object of meditation, 'the Yogin of controlled mind,' i.e., one having his mind steady because of his being purified in mind through contact with Me, comes to the peace which abides in Me, which is of the highest degree of beatitude. That means he comes to the peace which is the supreme end of beatitude which abides in Me. For the person who commences Yoga of the self, Sri Krsna, after thus teaching how the mind should be fixed on the Lord, who is the holy and auspicious object of meditation, proceeds in order to effect the purification of the mind, to speak of the other side of Yoga:

6.15 Yunjan, concentrating; atmanam, the mind; evam, thus, according to the methods shown above; sada, for ever; the yogi, niyata-manasah, of controlled mind; adhi-gacchati, achieves; santim, the Peace, the indifference to worldly attachments and possessions; nirvana-paramam, which culminates in Liberation; and mat-samstham, which abides in Me. Now are bieng mentioned the rules about the yogi's food etc.:

6.15 Ever applying his mind in this way, the Yogin of controlled mind, attains the peace which is the summit of beatitude and which abides in Me.

6.15 Concentrating the mind thus for ever, the yogi of controlled mind achieves the Peace which culminates in Liberation and which abides in Me.