In my opinion, the first step in reading any Gospel text is to situate the text within the context of the organization of the Gospels. Most scholars agree that Matthew and Luke had before them the Gospel of Mark and another source Q. The only evidence that we have for Q are the common passages in both Matthew and Luke. Both Mark and Luke draw on sources which are unique to each of them.
All the material in last week's parable on the Master and Steward and this week's parable on the Rich man and the Poor Man are from Luke's sources. Nothing from Mark at all! However, there is one very significant passage from Q:
Luke 16:13 No servant can serve two masters: for either he will hate the one and love the other; or he will hold to the one and despise the other. You cannot serve God and mammon.
If we look at where this passage occurs in Matthew (below the break) we see that it occurs in a whole series of Q passages in Matthew. We know they are Q because Luke has brought them all into different places in his Gospel. It is likely that Matthew just copied Q, while Luke used the passages in various places to shape his Gospel
When we study or preach upon the Gospels for last week or this week it should be within the context of them being interpreted in the light of Q presented likely in its original form in Matthew, i.e. the contrast between Heavenly Treasures and Early Treasures.
In last week's Gospel the steward was so concerned for his self-interest and earthy treasures that he was criticized for neglecting his master's interests. In this week's Gospel the rich man is so concerned with his earthly treasures that he neglects storing up heavenly treasure in the form of taking care of the poor on his doorstep.
I would begin preaching this week's Gospel with the Luke 16:13 that ends last week's Gospel and then articulate simple lifestyles that focus upon placing the heart where true lasting treasure abides in contrast to those of the rich and famous.