buddhim casya vinirbhinnam
vag-iso dhisnyam avisat
pratipattir yato bhavet
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
When the intelligence of the gigantic form separately became manifest, Brahma, the lord of the Vedas, entered into it with the partial power of understanding, and thus an object of understanding is experienced by the living entities.