One who is situated in knowledge of Kṛṣṇa and acts accordingly is executing devotional service. In pursuing the process initiated by Kapila man failed to fathom the same for hundreds and thousands of years. The Supreme Lord Kṛṣṇa has, in a few words, lifted the shroud of mystery and revealed the truth:
Earth, water, fire, air, ether, mind, intelligence, and false ego—all together these eight constitute My separated material energies. Besides these, O might-armed Arjuna, there is another, superior energy of Mine, which comprises the living entities who are exploiting the resources of this material, inferior nature. All created beings have their source in these two natures. Of all that is material and all that is spiritual in this world, know for certain that I am both the origin and the dissolution.
Those who cannot understand this truth remain far from the science of devotional service, while those who do understand it are strengthened in their devotional life. Lord Kṛṣṇa is the Supreme Personality of Godhead, the supreme male. So, when the supreme male is present, automatically material nature, his female counterpart, is there to serve Him. Those who falsely pose as the Supreme Person claim to have the material nature at their disposal and conclude that nature is no longer at Lord Kṛṣṇa's beck and call. Naturally this is absurd, and only fools will make such a claim.