Kṛṣṇa and Yogamāyā appeared as brother and sister—the Supreme Powerful and the supreme power. Although there is no clear distinction between the Powerful and the power, power is always subordinate to the Powerful. Those who are materialistic are worshipers of the power, but those who are transcendentalists are worshipers of the Powerful. Kṛṣṇa is the Supreme Powerful, and Durgā is the supreme power within the material world. Actually people in the Vedic culture worship both the Powerful and the power. There are many hundreds and thousands of temples of Viṣṇu and Devī, and sometimes they are worshiped simultaneously. The worshiper of the power, Durgā, or the external energy of Kṛṣṇa, may achieve all kinds of material success very easily, but anyone who wants to be elevated transcendentally must engage in worshiping the Powerful in Kṛṣṇa consciousness.
The Lord also declared to Yogamāyā, "My plenary expansion Ananta Śeṣa is within the womb of Devakī. On account of being forcibly attracted to the womb of Rohiṇī, He will be known as Saṅkarṣaṇa and will be the source of all spiritual power, or bala, by which one can attain the highest bliss of life, which is called ramaṇa. Therefore the plenary portion Ananta will be known after His appearance either as Saṅkarṣaṇa or as Balarāma."