Explain what the difference would be,if I read those epistles in a different order.I have to hear this! lol.
It seems to me that the value that this would have for you depends largely on your beliefs about how Scripture was inspired. If you believe, for example, that God was speaking directly through the Biblical authors (Dictation Theory), then you would likely get little benefit out such an exercise.
However, many Christians believe that God allowed each of the Biblical writers to express his or her understandings, personality, as such in the text, with the Holy Spirit guiding the process to ensure that no errors were made (Plenary Verbal Inspiration Theory). For those who accept PVIT (and also for those who accept the Limited Inspiration Theory, which is admittedly frowned upon by most evangelicals, including, I believe Wright himself), it is very helpful to consider chronology. Unless one believes that God directly dicatated His words to Paul, one must consider the ramifications of the fact that Paul likely took some time in understanding the completeness of Grace. Thus, his thought process likely evolved throughout his ministry, as he began to see the reality of how the Church and her individual congregations function and as he had to address the dysfunction of the Church. We see this same type of evolution of thinking occur in Peter throughout the Gospels and the Book of Acts; why would we assume that Paul did not go through similar transitions himself? In fact, I believe that a thorough reading of 1 & 2 Thessalonians makes it quite clear that Paul did go through this process, assuming of course that Paul wrote both letters.
If we accept that Paul very likely went through a transition in his thinking, with God revealing the nuances His truth to Paul gradually rather than instantly, then it would stand to reason that we might want to observe how Paul's thinking on the topic of Grace evolved over time. To do this, we would need to look carefully at chronology of his writings, reading the earlier writings as likley reflecting a more elementary understanding of Grace and his later writings as the completion of God's revelation to Him. This in no way suggests that that the earlier writings are erroneous. Rather, it is much like looking at the development of understanding of math (or any other subject) in a schoolkid. A first grader could likely tell you accurately that 5+2=7, but would likely not even attempt to tell you about multiplication. A third grader might tell you, very accurately that 5+2=7
and that 5X2=10. A fourth grader might tell you, not only these two facts but that 5/2= 2 rem. 1 (if that is what they still teach kids these days). And so on until the child reaches college and can explain complex calculus that is well over my own head. Assuming that Paul went through a similar experience in his understanding of Grace, it is immensely helpful to explore the chronology (and many other contextual factors, including the fact that some of his writings likely reviewed elementary theology for those congregations who missed the point) of his writings for very much the same reason that you would not expect a 1st grader to make sense out of a 12th grade calculus textbook.