ādyo 'vatāraḥ puruṣaḥ parasya
kālaḥ svabhāvaḥ sad-asan manaś ca
dravyaṁ vikāro guṇa indriyāṇi
virāṭ svarāṭ sthāsnu cariṣṇu bhūmnaḥ
ādyaḥ avatāraḥ - the original incarnation; puruṣaḥ - Kāraṇābdhiśāyī Viṣṇu; parasya - of the Supreme Lord; kālaḥ - time; svabhāvaḥ - space; sat-asat - cause and effect; manaḥ ca - as well as the mind; dravyam - the five elements; vikāraḥ - transformation or the false ego; guṇaḥ - modes of nature; indriyāṇi - senses; virāṭ - the universal form; svarāṭ - Garbhodakaśāyī Viṣṇu; sthāsnu - immovable; cariṣṇu - movable; bhūmnaḥ - of the Supreme Personality of Godhead.
This is a quotation from Śrīmad-Bhāgavatam (2.6.42). For an explanation, refer to Ādi-līlā, chapter five, verse 83.