Śukadeva Gosvāmī was very much encouraged when Mahārāja Parīkṣit asked him why the cowherd boys did not discuss the death of Aghāsura until after one year had passed. He explained thus: “My dear King, you are making the subject matter of the transcendental pastimes of Kṛṣṇa fresher by your inquisitiveness.”
It is said that it is the nature of a devotee to constantly apply his mind, energy, words, ears, etc., in hearing and chanting about Kṛṣṇa. This is called Kṛṣṇa consciousness, and for one who is rapt in hearing and chanting Kṛṣṇa, the subject matter never becomes hackneyed or old. That is the significance of transcendental subject matter in contrast to material subject matter. Material subject matter becomes stale, and one cannot hear a certain subject for a long time; he wants change. But as far as transcendental subject matter is concerned, it is called nityanavanavāyamāna. This means that one can go on chanting and hearing about the Lord and never feel tired but will remain fresh and eager to hear more and more.