SB 1.5 - The literatures of the crows
Those words which do not describe the glories of the Lord, which purify not only the author but the whole world, are considered by saintly persons to be like a place of pilgrimage for crows. Since the all perfect persons are inhabitants of the transcendental abode, they do not derive any pleasure there. The fruitive workers or passionate men are compared to the crows, whereas the saintly persons are compared to the swans. The swans do not take pleasure in the places where crows are assembled for conferences and meetings.
Nature has influenced different species of life with different mentalities, and it is not possible to bring them up into the same rank and file. There are different kinds of literature for different types of men. The market literatures which attract men of the crow’s categories are those related to the gross body and subtle mind, and contain refused remnants of sensuous topics. Such poetry and prose is considered decoration of a dead body. The swanlike spiritually advanced men have nothing to do with such literatures, which are in the modes of passion and ignorance. They avoid the fruitive activities for gross bodily sense satisfaction or the subtle speculation of the material egoistic mind. Social literary men, scientists, mundane poets, theoretical philosophers and politicians are all dolls of the material energy. Indulging in the pleasure of the prostitute hunters, they take pleasure where rejected subject matters are thrown.
But literatures which describe the glories of the Lord are enjoyed by the paramahaṁsas who have grasped the essence of human activities. It may be said that none of the Purāṇas written by Vyāsa should be considered a place for crows, since nothing there is completely devoid of the glories of the Lord. But in SB 12.12.66 it is said that Nārāyaṇa is not glorified much in other works, but is abundantly and constantly described throughout the various narrations of Bhāgavatam. Thus we can understand that in other Purāṇas many of the stories are devoid of the glories of the Lord.