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 about 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 nitya-nava-navāyamāna. This means that one can go on chanting and hearing about the Lord and never feel tired but remain fresh and eager to hear more and more.
It is the duty of the spiritual master to disclose all confidential subject matter to the inquisitive and sincere disciple. Thus Śukadeva Gosvāmī began to explain why the killing of Aghāsura was not discussed until one year had passed. Śukadeva Gosvāmī told the King, “Now hear of this secret with attention. After saving His friends from the mouth of Aghāsura and killing the demon, Lord Kṛṣṇa brought His friends to the bank of the Yamunā and addressed them as follows: "My dear friends, just see how this spot is very nice for taking lunch and playing on the soft, sandy Yamunā bank. You can see how the lotus flowers in the water are beautifully blown and how they distribute their fragrance all around. The chirping of the birds along with the cooing of the peacocks, surrounded by the whispering of the leaves in the trees, combine and present sound vibrations that echo one another. And this just enriches the beautiful scenery created by the trees here. Let us have our lunch in this spot because it is already late and we are feeling hungry. Let the calves remain near us, and let them drink water from the Yamunā. While we engage in our lunch-taking, the calves may engage in eating the soft grasses that are in this spot."