The Crying Dog: How to Tell if the Law is Hitting Home
If you want to know which dog has been struck, it is the one who cries out. Therefore, you are accusing yourself , if you grumble, and are defaming yourself. As Cicero says, when vices are rebuked in general terms, whoever becomes angry at it shows himself to be guilty. Whoever cannot bear it when unbelief is rebuked along with the fruits of unbelief, he is most certainly the dog who has been struck.
(Martin Luther, sermon of June 7, 1545, in Luther’s Works, Volume 58, forthcoming from Concordia Publishing House in November 2010).