What do you think Chillingworth means when he says of the father of Hester's child "I shall read (the letter of infamy) on his heart"?

I do not disagree with what has already been said, but I think that the original state of Chillingworth's "heart" is not as bent on revenge as it later becomes. Admittedly, he starts out to find out who the father is, and he has been hurt by Hester's behavior --- although he realizes that part of it is his fault. One of the things the story is about, however, is how the obsession with revenge corrupts the one seeking it to where Hester can say, "That man's sin is blacker than our own --- he has violated in cold blood the sanctity of the human soul." From seeking to reveal the father, perhaps for revenge, perhaps to make him own up to what he has done, Chillingworth becomes the most evil (?) character in the book ... but it is the transformation that is interesting, not the evil.