She answers with a question, not with an explanation. In canto XIX the Eagle, formed by the souls of the just, repeats Dante's doubt: a man is born on the banks of the Indus, where no one speaks of Christ, nor reads, nor writes; he has good desires and good deeds and dies without baptism and without faith; where is his guilt? The answer is: who are you, who wish to sit in the chair to judge from a thousand miles away with the short sight of a palm's breadth?
The Eagle does not deny justice: she says that the sight the world receives sinks into eternal justice as the eye into the sea, which from the shore sees the bottom and out at sea does not, though the bottom exists. She adds that many cry out "Christ, Christ" and will be at judgment farther from him than someone who does not know him. The man of the Indus stops being the subject; he becomes the reader.
In canto XX the Eagle shows, in her eyes, two saved pagans: Rhipeus the Trojan of the Aeneid, and the light that common reading identifies with Trajan. She explains that the kingdom of heaven suffers violence from ardent love and living hope, which overcome the divine will because it wants to be overcome, and that the two left their bodies as Christians, in firm faith. Their case does not open a rule: the man of the Indus remains without an answer. Mortals must be cautious in judging, because not even the blessed know all the elect.