Ambrose of Milan — as excerpted in the Catena Aurea on Luke 11:29-32

“Now as the sign of Jonas is a type of our Lord’s passion, so also is it a testimony of the grievous sins which the Jews have committed. We may remark at once both the mighty voice of warning, and the declaration of mercy. For by the example of the Ninevites both a punishment is denounced, and a remedy promised. Hence even the Jews ought not to despair of pardon, if they will but practise repentance.”