Kṛṣṇa provides the tactical ‘How-To’ of meditation. First, one must give up all material desires born of ‘saṅkalpa’, or mental imagination, without exception. You must stop the habit of ‘fantasizing’ about future enjoyment. If you kill the imagination, you kill the desire. Then, one must use the mind to regulate the entire set of senses from all sides. It is not enough to control just one or two habits; the mind must surround the senses like a shepherd guarding a flock, ensuring that none of them stray into the territory of temptation. One must be vigilant ‘samantataḥ’—from every direction. This is a process of total internal containment. Kṛṣṇa is teaching Arjuna that he must become the master of his own internal borders. By shutting down the factory of desires and guarding the gateways of the senses, Arjuna can create the internal vacuum of stillness necessary for the light of the soul to shine through. Discipline is the price of clarity.