Śrīmad-Bhāgavatam · Texts 10.50.5-6
निरीक्ष्य तद्बलं कृष्ण उद्वेलमिव सागरम् ।
स्वपुरं तेन संरुद्धं स्वजनं च भयाकुलम् ॥ ५ ॥
चिन्तयामास भगवान् हरि: कारणमानुष: ।
तद्देशकालानुगुणं स्वावतारप्रयोजनम् ॥ ६ ॥
nirīkṣya tad-balaṁ kṛṣṇa
udvelam iva sāgaram
sva-puraṁ tena saṁruddhaṁ
sva-janaṁ ca bhayākulam
cintayām āsa bhagavān
hariḥ kāraṇa-mānuṣaḥ
tad-deśa-kālānuguṇaṁ
svāvatāra-prayojanam
Although Lord Kṛṣṇa, the Supreme Personality of Godhead, is the original cause of this world, when He descended to the earth He played the role of a human being. Thus when He saw Jarāsandha’s assembled army surrounding His city like a great ocean overflowing its shores, and when He saw how this army was striking fear into His subjects, the Lord considered what His suitable response should be according to the time, place and specific purpose of His current incarnation.
Read the purport on Vedabase.ioFrom Canto 10, chapter 14 onward, the translation and purports were completed by Śrīla Prabhupāda's disciples after his departure, and published by the Bhaktivedanta Book Trust.