ete camsa-kalah pumsah
krsnas tu bhagavan svayam
mrdayanti yuge yuge
ete—these; ca—and; amsa—plenary portions; kalah—parts of plenary portions; pumsah—of the purusa-avataras; krsnah—Lord Krsna; tu—but; bhagavan—the Supreme Personality of Godhead; svayam—Himself; indra-ari—the enemies of Lord Indra; vyakulam—full of; lokam—the world; mrdayanti—make happy; yuge yuge—at the right time in each age.
"All these incarnations of Godhead are either plenary portions or parts of the plenary portions of the purusa-avataras. But Krsna is the Supreme Personality of Godhead Himself. In every age He protects the world through His different features when the world is disturbed by the enemies of Indra."
This statement of Srimad-Bhagavatam (1.3.28) definitely negates the concept that Sri Krsna is an avatara of Visnu or Narayana. Lord Sri Krsna is the original Personality of Godhead, the supreme cause of all causes. This verse clearly indicates that incarnations of the Personality of Godhead such as Sri Rama, Nrsimha and Varaha all undoubtedly belong to the Visnu group, but all of Them are either plenary portions or portions of plenary portions of the original Personality of Godhead, Lord Sri Krsna.
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