विज्ञानसारथिर्यस्तु मनः प्रग्रहवान्नरः ।
सोऽध्वनः पारमाप्नोति तद्विष्णोः परमं पदम् ॥ ९॥
vijñānasārathiryastu manaḥ pragrahavānnaraḥ .
so’dhvanaḥ pāramāpnoti tadviṣṇoḥ paramaṃ padam .. 9..
A man who has discrimination for his charioteer and holds the reins of the mind firmly, reaches the end of the road; and that is the supreme position of Vishnu.
Swami Vivekananda Says —
Here is a beautiful figure. Picture the Self to be then rider and this body the chariot, the intellect to be the charioteer, mind the reins, and the senses the horses. He whose horses are well broken, and whose reins are strong and kept well in the hands of the charioteer (the intellect) reaches the goal which is the state of Him, the Omnipresent. But the man whose horses (the senses) are not controlled, nor the reins (the mind) well managed, goes to destruction.[Source]
Control the mind, cut off the senses, then you are a Yogi; after that, all the rest will come. Refuse to hear, to see, to smell, to taste; take away the mental power from the external organs. You continually do it unconsciously as when your mind is absorbed; so you can learn to do it consciously. The mind can put the senses where it pleases. Get rid of the fundamental superstition that we are obliged to act through the body. We are not. Go into your own room and get the Upanishads out of your own Self. You are the greatest book that ever was or ever will be, the infinite depository of all that is. Until the inner teacher opens, all outside teaching is in vain. It must lead to the opening of the book of the heart to have any value.[Source]