Whoever exclusively remembers Me constantly, to that ever-united yogi, I am easily available.
Krishna earlier said (8.6-10), only by long, ceaseless and intense effort one can attain the supreme Abode, which Vedic Knowers uphold as splendid and sublime. It is the unfailing supreme gain the exclusive seekers aspire for.
Nonetheless, he prescribes restraint of senses, mind and prāna coupled with incessant chanting of OM even at the time of death as sufficient means to attain it.
Now he says, the Supreme is easily attainable by ceaseless remembrance, which is solely a mind effort.
Mind is the sole focus of human life for any gain, ascent or descent alike. When the mind remains centred in the Supreme by means of unbroken remembrance, it becomes qualitative and powerful to regulate and sublimate the senses, intelligence and ego. It will also gain necessary purity and concentration, as a natural culmination. Attaining the Supreme is virtually the ability to fix the mind totally on the Supreme. Such exclusive fixation is the means as well as the ideal of spiritual life!