Now the Spirit rightly shewed Himself in the form of a dove, for He is not seen in His divine substance. Let us consider the mystery why like a dove? Because the grace of baptism requires innocence, that we should be innocent as doves. The grace of baptism requires peace, which under the emblem of an olive branch the dove once brought to that ark which alone escaped the deluge.
Reproduced in full. Translation: Oxford 1841 (Newman), public domain (Public domain).