When the creation is manifest, it is maintained by Him; indeed, whatever manifestation we see is but a transformation of His external energy. When the Supreme Lord withdraws His external energy, everything enters into Him. In the first of the four verses, the word aham is given three times to stress that the Supreme Personality of Godhead is full with all opulences. Aham is stated three times just to chastise one who cannot understand or believe in the transcendental nature and form of the Supreme Lord.
The Lord possesses His internal energy, His external, marginal and relative energies, and the manifestation of the cosmic world and the living entities. The external energy is manifested by the qualitative modes (guṇas) of material nature. One who can understand the nature of the living entity in the spiritual world can actually understand vedyam, or perfect knowledge.