In the Epistle for today, Paul reminds his gentile followers of how different they are now compared to who they once were. This is a point often made to recent graduates of some courses of study, and it applies here as well.
I note, however, an appreciation shown for the realities of life and an appeal to common-sense moderation. “Be angry and sin not” shows that people are going to upset you. The difference is what you do as a result.