Sankhaya Yog-Bhagavad Gita Chapter 2 [Contents of the Gita Summarized]
Krishna Said > Shaloka: 64
One who can control his senses by practicing the regulated principles of freedom can obtain the complete mercy of the Lord and thus become free from all attachment and aversion.
It is already explained that one may externally control the senses by some artificial process, but unless the senses are engaged in the transcendental service of the Lord, there is every chance of a fall. Although the person in full Krishna consciousness may apparently be on the sensual plane, because of his being Krishna conscious, he has no attachment to sensual activities. The Krishna conscious person is concerned only with the satisfaction of Krishna, and nothing else. Therefore he is transcendental to all attachment. If Krishna wants, the devotee can do anything which is ordinarily undesirable; and if Krishna does not want, he shall not do that which he would have ordinarily done for his own satisfaction. Therefore to act or not to act is within his control because he acts only under the direction of Krishna. This consciousness is the causeless mercy of the Lord, which the devotee can achieve in spite of his being attached to the sensual platform.