Tamāla Kṛṣṇa: Purport: "This is not a question of embodied life. It is the nature of the soul itself to be always active. The proof is that without the presence of the spirit soul there is no movement of the material body. The body is only a dead vehicle to be worked by the spirit soul, and therefore it is to be understood that the soul is always active and cannot stop even for a moment. As such, the spirit soul has to be engaged in the good work of Kṛṣṇa consciousness. Otherwise it will be engaged in the occupations dictated by the illusory energy."
"In contact with material energy, the spirit soul acquires material modes, and to purify the soul from such affinity it is necessary to engage it in the prescribed duties enjoined in the śāstras, or scriptures. But if the soul is engaged in his natural function of Kṛṣṇa consciousness, whatever he is able to do is good for him."
Prabhupāda: Practically that is real silence. If you simply engage yourself in activities of Kṛṣṇa consciousness, then automatically your activities in māyā become silent. Just like the same example I have given. Here is a glass. If you want to fill up with milk, the water will go automatically. You have to throw away the water. You cannot put the water and the milk at the same time in this glass. Similarly, if you become active in Kṛṣṇa consciousness, you automatically become silent in material activities—without any separate endeavor. It is so nice.
And if you try artificially to stop, to become silent from material activities, it will not be possible. You may meditate for fifteen minutes or for fifteen hundred minutes or fifteen thousand years, it will not be possible. The mind is very strong. Mind's business is to accept and reject, accept and reject. You accept something, you reject something.
Better thing is that we accept something Kṛṣṇa conscious under the direction of disciplic succession. That is your . . . should be the aim of life, and you are successful. You have to accept something. Simply by rejecting, it will not help you. But you have to accept something. That acceptance is Kṛṣṇa consciousness. Simply negation will not help you. You must have some positive engagement.