“Lord Vishnu, the Supreme, cannot exhibit His power everywhere without His principal energy. It is said, shakti shaktiman abheda: the power and the powerful are identical. Therefore mother Lakshmi, the goddess of fortune, is the constant companion of Lord Vishnu; they remain together constantly. One cannot keep Lakshmi in one's home without Lord Vishnu.” (Shrila Prabhupada, Shrimad Bhagavatam, 6.19.6 Purport)