Luke used a broader word (translated “criminals”) than Mark and Matthew (“rebels”). Sometimes the words were interchangeable. Luke’s whole gospel, however, showed Jesus’ love for all who are outcast and looked down on. It’s possible that he wanted Jesus’ pledge to the man who asked for a place in his kingdom to show clearly that there is grace for absolutely anyone who desires it.
What an extraordinary request for that crucified man to make to Jesus! What made him think this man crucified next to him would ever have a kingdom? Have you ever felt (or known someone who felt) that “I’ve done too much—waited too long—I can’t turn to God now?” What does the man’s request and Jesus’ response say to that attitude?
In contrast, the other man said, “Aren’t you the Messiah?” That did not express faith, as the scornful “Save yourself and us” showed. Most of us have a deep-seated fear of being gullible or naïve. In what ways can this cynicism become spiritually dangerous? Which of Jesus’ promises do you struggle most to trust? Which is most precious to you?
From Grow.Pray.Study (GPS) The Church of the Resurrection--Weekly Guide