Devibhagavatapurana 1.1.3

1.1.3

aṣṭādaśa purāṇāni kṛṣṇena muninānagha |
kathitāni sudivyāni paṭhitāni tvayānagha ||

O sinless one! you have gone through all the eighteen Purânas composed by Krisna Dvaipâyana; these are endowed with five excellent characteristics and full of esoteric meanings.
Note:-- The characteristics are to make the mantras reveal to one's own self, to realise, to transfer to others the S’akti, force thereof, to prove the various manifestations of the several effects thereof, etc.