Salmos 28

Salmos 28:3

It is good that the Spirit descended upon the Lord in the form of a dove, so that the faithful may learn that they cannot be filled with his Spirit unless they are simple, unless they possess true peace with their brothers, which is signified by the kiss of doves. Ravens also have kisses, but they tear flesh (which a dove does not do at all), signifying those "who speak peace with their neighbor, but wicked things are in their hearts." A dove, which by nature is innocent of the tearing of the flesh, most suitably fits those innocents who pursue peace and sanctity with everyone. — Homilies on the Gospels 1:15