CC Ādi 5.63

ghaṭera nimitta-hetu yaiche kumbhakāra
taiche jagatera kartā — puruṣāvatāra
Word for word: 
ghaṭera — of the earthen pot; nimitta-hetu — original cause; yaiche — just as; kumbhakāra — the potter; taiche — similarly; jagatera kartā — the creator of the material world; puruṣa-avatāra — the puruṣa incarnation, or Kāraṇārṇavaśāyī Viṣṇu.
Translation: 
Just as the original cause of an earthen pot is the potter, so the creator of the material world is the first puruṣa incarnation [Kāraṇārṇavaśāyī Viṣṇu].