The Yogi gets immense inner strength and power of concentration. His mind becomes ite steady through constant practice of concentration and meditation. He practises concentration first on the lower Chakras viz..
Translation
8.10 At the time of death, having fully fixed the Prana (vita force) between the enrows with an unswering mind, and being imbued with devotion as also the strength of concentration, he reaches that resplendent supreme person.
8.10 At the time of death, with unshaken mind, endowed with devotio, by the power of Yoga, fixing the whole life-breath in the middle of the two eyrows, he reaches that resplendent Supreme Person.
8.10 Prayana-kale, at the time of death; after first brining the mind under control in the lotus of the heart, and then lifting up the vital force-through the nerve going upward-by gradually gaining control over (the rudiments of nature such as) earth etc. [Space, air, fire, water and earth.] and after that, samyak, avesya, having fully fixed; pranam, the Prana (vital force); madhye, between; the bhruvoh, eye-brows, without losing attention; acalena manasa, with an unwavering mind; he, the yogi possessed of such wisdom, yuktah, imbued; bhaktya, with devotion, deep love; ca eva, as also; yoga-balena, [Yoga means spiritual absorption, the fixing of the mind on Reality alone, to the exclusion of any other object.] with the strength of concentration-i.e; imbued with that (strength) also, consisting in steadfastness of the mind arising from accumulation of impressions resulting from spiritual absorption; upaiti, reaches; tam, that; div yam, resplendent; param, supreme; purusam, Person, described as 'the Omniscient, the Ancient,' etc.
The Lord again speaks of Brahman which is sought to be attained by the process going to be stated, and which is described through such characteristics as, 'What is declared by the knowers of the Vedas,'etc.:
Meaning
The Yogi gets immense inner strength and power of concentration. His mind becomes ite steady through constant practice of concentration and meditation. He practises concentration first on the lower Chakras viz.. Muladhara. Svadhishthana and Manipura. He then concentrates on the lotus of the heart (Anahata Chakra). Then he takes the lifreath (Prana) through the Sushumna and fixes it in the middle of the two eyrows. He eventually attains the resplendent Supreme Purusha (Person) by the above Yogic practice. This is possible for one who has devoted his whole life to the practice of Yoga.
Word by word
प्रयाणकाले at the time of death मनसा with mind अचलेन unshaken भक्त्या with devotion युक्तः joined योगबलेन by the power of Yoga च and एव only भ्रुवोः of the two eyrows मध्ये in the middle प्राणम् Prana (breath) आवेश्य having placed सम्यक् thoroughly सः he तम् that परम् Supreme पुरुषम् Purusha उपैति reaches दिव्यम् resplendent.