In plain words
Kṛṣṇa said, “Pārtha! When doing such contemplation, the Manas must be centred on one object alone. The Manas must hold only one object; it must not roam among many objects. Not only that, one must be full of fondness and Bhakti for the object held. Ordinarily the Prema of human beings falls on ordinary, unstable things and goes to waste. It gets caught in many sorrows and pains. Whoever turns such Prema away from worldly objects and turns it back upon God can become blessed. Listen, I will tell you a little of what Bhakti is. The citta-vṛtti taking the form of its own object of meditation – that alone can be true Bhakti.”
“How can this be possible, Svāmī?” asked Pārtha.
“Arjuna! Bringing all the gateways of the senses under saṃyama, holding the Manas in the region of the heart, establishing the prāṇa in the region of the head, having taken up the yoga-dhāraṇā that relates to the Ātma, whoever, at the time of the prāṇa's departure, leaves the body uttering ‘Oṃ’, the Brahman, reaches Me. The citta-vṛtti attains the form of That,” said Kṛṣṇa.
కృష్ణుడు, “పార్థా!