CC Ādi 6.11

sahāya karena tāṅra la-iyā ‘pradhāna’
koṭi brahmāṇḍa karena icchāya nirmāṇa
Word for word: 
sahāya karena — He helps; tāṅra — His; lā-iyā — with; pradhāna — the material energy; koṭi-brahmāṇḍa — millions of universes; karena — does; icchāya — only by the will; nirmāṇa — creation.
Translation: 
He [Advaita Ācārya] helps in the pastimes of the puruṣa, with whose material energy and by whose will He creates innumerable universes.