The Holy Ghost the Comforter brought this, that the form of a servant which our Lord had received in the womb of the Virgin, being removed from the fleshly eye, He was manifested to the purified mental vision in the very form of God in which He remained equal to the Father, even while He deigned to appear in the flesh.
Reproduced in full. Translation: Oxford 1841 (Newman), public domain (Public domain).
Also cites: de Verb. Dom. serm. lx