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Śrī Īśopaniṣad
PURPORT
The Supreme Lord, Who is the Absolute Personality of Godhead, is not knowable even to the greatest philosopher through mental speculation. He can be known only by His devotees through His mercy. In the  Brahma-saṁhitā  it is said that the non-devotee philosopher who can travel at the speed of the mind, or at the velocity of the air, and who can travel in space for hundreds of years, will find the Absolute still far, far away from him. As described in the  Upaniṣads , the Absolute Personality of Godhead has His transcendental Abode, known as  Kṛṣṇa-loka , where He remains, engaged in His Pastimes. But by His inconceivable potency He can simultaneously reach every part of the creative energy. In the  Viṣṇu Purāṇa  this potency is compared with the light and heat of the fire. The fire can distribute its light and heat from one place, and similarly the Absolute Personality of Godhead, although fixed up in His transcendental Abode, can diffuse His different energies everywhere.
Such energies are innumerable, but principally they are classified into three: the internal potency, the marginal potency, and the external potency. In each and every one of them, there are hundreds and millions of sub-headings. The dominating demigods who are empowered to have control over the administration of natural phenomena such as the air, light, rain, etc. are all classified within the marginal potency of the Absolute Person. The living beings, including humans, are also products of the marginal potency of the Lord. The material world is the creation of the external potency of the Lord, and the spiritual sky, where the Kingdom of God is situated, is the manifestation of His internal potency.
The different energies of the Supreme Lord are represented everywhere by His different potencies. Although there is no difference between Him and His energies, still one should not wrongly conclude that the Supreme Lord, being thus distributed