Bhagavad Gita 7.24

7.24 The foolish think of Me, the Unmanifest, as having manifestation, knowing not My higher, immutable and most excellent nature.

Unintelligent men, who do not know Me perfectly, think that I, the Supreme Personality of Godhead, Kṛṣṇa, was impersonal before and have now assumed this personality. Due to their small knowledge, they do not know My higher nature, which is imperishable and supreme.