…fervently reciting the letter OM (the monosyllable representing Brahman), remembering Me, whoever sheds his body, attains the Supreme.
Explanation of verses 7.12 and 7.13 –
Step by step, Krishna takes the seeker to the spiritual ladder of redemption, the ultimate release one can experience and enjoy during his embodiment on earth.
Though the senses of perception and action together are ten, each of them is employed and directed by the mind alone. So, by deliberate thought and will, one can restrain all the ten alike at one stroke. Krishna wants the seeker to have such all-fold restraint. For this, make the mind rest in the heart itself, by stopping its outgoing tendencies.
There is enough freedom and scope for it. Exercise these without doubt or vacillation, says Krishna.
Draw the full prāna to the centre of the head, from where every breath is directed. This will enable a complete stilling of the senses and the mind. Then the seeker should centrate his senses, mind, intelligence and ego, on the Self, the source of all sentience and actions. This inner absorption is the essence of spirituality.
Your mind is the contact and connection with the world. Connected to the mind, the senses bring external perceptions. When solely engrossed in reciting OM, the mind is absorbed without distraction.
OM is the sound representing Brahman. By chanting OM exclusively – for which remembering the Teacher is a great help – the seeker becomes ever ready for spiritual departure from the world, any time.
The world is but a perceptional display of senses. But for the senses, it would not be there. When mind remains absorbed in itself, and when senses do not sense or comprehend, what or where can one go or enter? Nothing reigns except his own within, where the optional thought or mantra he would be chanting. Whatever does the chanting, that itself is what the seeker seeks and wishes to possess! All else is gone. He attains the great, grand fruition, fulfilment, the Grandeur and Magnificence called Release, Redemption, Liberation!