SB 3.33.3

sa eva viśvasya bhavān vidhatte
 guṇa-pravāheṇa vibhakta-vīryaḥ
sargādy anīho ’vitathābhisandhir
 ātmeśvaro ’tarkya-sahasra-śaktiḥ
Synonyms: 
saḥ — that very person; eva — certainly; viśvasya — of the universe; bhavān — You; vidhatte — carry on; guṇa-pravāheṇa — by the interaction of the modes; vibhakta — divided; vīryaḥ — Your energies; sarga-ādi — the creation and so on; anīhaḥ — the nondoer; avitatha — not futile; abhisandhiḥ — Your determination; ātma-īśvaraḥ — the Lord of all living entities; atarkya — inconceivable; sahasra — thousands; śaktiḥ — possessing energies.
Translation: 
My dear Lord, although personally You have nothing to do, You have distributed Your energies in the interactions of the material modes of nature, and for that reason the creation, maintenance and dissolution of the cosmic manifestation take place. My dear Lord, You are self-determined and are the Supreme Personality of Godhead for all living entities. For them You created this material manifestation, and although You are one, Your diverse energies can act multifariously. This is inconceivable to us.
Purport: 

The statement made in this verse by Devahūti that the Absolute Truth has many diverse energies although He personally has nothing to do is confirmed in the Upaniṣads. There is no one greater than Him or on an equal level with Him, and everything is completely done by His energy, as if by nature. It is understood herein, therefore, that although the modes of material nature are entrusted to different manifestations like Brahmā, Viṣṇu and Śiva, each of whom is particularly invested with different kinds of power, the Supreme Lord is completely aloof from such activities. Devahūti is saying, “Although You personally are not doing anything, Your determination is absolute. There is no question of Your fulfilling Your will with the help of anyone else besides Yourself. You are, in the end, the Supreme Soul and the supreme controller. Therefore Your will cannot be checked by anyone else.” The Supreme Lord can check others’ plans. As it is said, “Man proposes and God disposes.” But when the Supreme Personality of Godhead proposes, that desire is under no one else’s control. He is absolute. We are ultimately dependent on Him to fulfill our desires, but we cannot say that God’s desires are also dependent. That is His inconceivable power. That which may be inconceivable for ordinary living entities is easily done by Him. And in spite of His being unlimited, He has subjected Himself to being known from the authoritative scriptures like the Vedic literatures. As it is said, śabda-mūlatvāt: He can be known through the śabda-brahma, or Vedic literature.

Why is the creation made? Since the Lord is the Supreme Personality of Godhead for all living entities, He created this material manifestation for those living entities who want to enjoy or lord it over material nature. As the Supreme Godhead, He arranges to fulfill their various desires. It is confirmed also in the Vedas, eko bahūnāṁ yo vidadhāti kāmān: the supreme one supplies the necessities of the many living entities. There is no limit to the demands of the different kinds of living entities, and the supreme one, the Supreme Personality of Godhead, alone maintains them and supplies them by His inconceivable energy.