As revealed by the Lord in 'Bhagavad-Gita As It Is', the Supreme Personality of Godhead can be known in His real nature by dint of pure devotional service only. Thus, only the great devotees of the Lord who are able to clear the mind of all material dust by rigid devotional service can experience the Lord as He is.
'Jitendriya' means one who has full control over the senses. The senses are active parts of the body, and their activities cannot be stopped. The artificial means of the yogic process