Spoken by Krsna
Bhagavad-gita As It Is
BG Chapters 1 - 6
BG 4.4, Purport:
It is necessary that everyone, for his own interest, know the science of Kṛṣṇa. Therefore, when Kṛṣṇa Himself speaks about Himself, it is auspicious for all the worlds. To the demons, such explanations by Kṛṣṇa Himself may appear to be strange because the demons always study Kṛṣṇa from their own standpoint, but those who are devotees heartily welcome the statements of Kṛṣṇa when they are spoken by Kṛṣṇa Himself. The devotees will always worship such authoritative statements of Kṛṣṇa because they are always eager to know more and more about Him.