Jnana Yoga-Bhagavad Gita Chapter 4 [Approaching the Ultimate Truth]
Krishna Said > Shaloka: 39
A faithful man who is absorbed in transcendental knowledge and who subdues his senses quickly attains the supreme spiritual peace.
Such knowledge in Krishna consciousness can be achieved by a faithful person who believes firmly in Krishna. One is called a faithful man who thinks that, simply by acting in Krishna consciousness, he can attain the highest perfection. This faith is attained by the discharge of devotional service, and by chanting “Hare Krishna, Hare Krishna, Krishna Krishna, Hare Hare/ Hare Rama, Hare Rama, Rama Rama, Hare Hare,” which cleanses one’s heart of all material dirt. Over and above this, one should control the senses. A person who is faithful to Krishna and who controls the senses can easily attain perfection in the knowledge of Krishna consciousness without delay.