eṣa sākṣād dharer amśo
jāto loka-rirakṣayā
iyaṁ ca tat-parā hi śrīr
anujajñe 'napāyinī
eṣaḥ - this male; sākṣāt - directly; hareḥ - of the Supreme Personality of Godhead; amśaḥ - partial representative; jātaḥ - born; loka - the entire world; rirakṣayā - with a desire to protect; iyam - this female; ca - also; tat-parā - very much attached to him; hi - certainly; śrīḥ - the goddess of fortune; anujajñe - took birth; anapāyinī - inseparable.
In Bhagavad-gītā the Lord says that whenever one sees an extraordinary power, he should conclude that a specific partial representation of the Supreme Personality of Godhead is present. There are innumerable such personalities, but not all of them are direct viṣṇu-tattva plenary expansions of the Lord. Many living entities are classified among the śakti-tattvas. Such incarnations, empowered for specific purposes, are known as śaktyāveśa-avatāras. King Pṛthu was such a śaktyāveśa-avatāra of the Lord. Similarly, Arci, King Pṛthu’s wife, was a śaktyāveśa-avatāra of the goddess of fortune.