According to the Viṣṇu Purāṇa (6.7.61-3), the living entities are considered kṣetrajña energy. Although the living entity is part and parcel of the Supreme Lord and is fully cognizant, he nonetheless becomes entrapped by material contamination and suffers all the miseries of material life. Such living entities live in different ways in accordance to the degree of their entanglement in material nature. The original energy of the Supreme Lord is spiritual and nondifferent from the Supreme Absolute Personality of Godhead. The living entity is called the marginal energy of the Supreme Lord, and the material energy is called the inferior energy. Due to his material inebriety, the living entity in the marginal position becomes entangled with the inferior energy, matter. At such a time he forgets his spiritual significance, identifies himself with material energy and thereby becomes subjected to the threefold miseries. Only when he is free from such material contamination can he be situated in his proper position.
According to Vedic instructions, one should understand the constitutional position of the living entity, the position of the Lord, and the position of material energy in their interrelation. First of all, one should try to understand the constitutional position of the Supreme Lord, the Personality of Godhead. That Supreme Lord has an eternal, cognizant, blissful body, and His spiritual energy is distributed as eternity, knowledge and bliss. In His blissful identity can be found His pleasure potency, and in His eternal identity He can be seen as the cause of everything. In His cognizant identity, He is the supreme knowledge. Indeed, the word kṛṣṇa indicates that supreme knowledge. In other words, the Supreme Personality, Kṛṣṇa, is the reservoir of all knowledge, pleasure and eternity. The supreme knowledge of Kṛṣṇa is exhibited in three different energies—internal, marginal and external. By virtue of His internal energy, He exists in Himself with His spiritual paraphernalia; by means of His marginal energy, He exhibits Himself as the living entities, and by means of His external energy He exhibits Himself as material energy. Behind each and every energetic exhibition there is the background of eternity, pleasure, potency and full cognizance.