St. Luke's Passion

I went to the Dominicans for Mass this morning and the homilist (Fr. John Langlois) said something very interesting (as Dominicans are in the habit of doing).

He said that the bit about the Good Thief on the cross (which is mentioned in St. Luke but not in the other Gospels) is the Parable of the Prodigal Son lived out.  He drew parallels between the son's humble request and the good thief's and between the father's joyfully superabundantly generous reply and Jesus'.  As evidence that these parallels are something he read out of the text rather than read into it, he pointed out that St. Luke is also the only one to have the parable of the Prodigal Son.