What about the old man makes father Gonzaga Suspect that he is not an angel ? What does Father Gonzaga do in order to prove whether or not the Old Man is an angel ?

Father Gonzaga, the local priest, responds to the old man from a Catholic point of view. He confronts the angel, speaking Latin, which he considers to be the language of god, but the angel does not understand. Father Gonzaga also objects to the angel's shabby appearance. He decides that the angel must be an imposter, and warns the people not to follow him, while promising meanwhile to write his bishop for a final verdict on the old man's angelic status.