Liberated souls have no interest in materialistic activities. The impersonalist theory that after liberation one becomes inactive and need not hear anything does not prove that a liberated person is actually inactive. A living soul cannot be inactive. He is active either in the conditioned state or in the liberated state. A diseased person, for example, is also active, but his activities are all painful. The same person, when freed from the diseased condition, is still active, but in the healthy condition the activities are full of pleasure. Similarly, the impersonalists only seek to get free from the diseased, conditioned activities, but they have no information of activities in the healthy condition. Those who are actually liberated and in full knowledge take to hearing the activities of Kṛṣṇa; such engagement is pure spiritual activity.
It is essential for persons who are actually liberated to hear about the pastimes of Kṛṣṇa. That is the supreme relishable subject matter for one in the liberated state. Also, if persons who are trying to be liberated hear such narrations as the Bhagavad-gītā and Śrīmad-Bhāgavatam, then their path of liberation becomes very clear. The Bhagavad-gītā is the preliminary study of Śrīmad-Bhāgavatam. By studying the Gītā, one becomes fully conscious of the position of Lord Kṛṣṇa; and when he is situated at the lotus feet of Kṛṣṇa, he understands the narrations of Kṛṣṇa as described in Śrīmad-Bhāgavatam. Lord Caitanya has therefore advised His followers that their business is to propagate kṛṣṇa-kathā.