Final answer:
The author includes Scripture in his speech to advise on moral life and to address issues that are both economic and moral. It also serves a rhetorical purpose, connecting deeply with his audience's values and challenging conventional norms.
Step-by-step explanation:
The author likely includes references to Scripture in his speech because Scripture contains passages that deal with human matters, suggesting guidelines for moral life. Moreover, these references were not merely about economic concerns but also about moral ones. Additionally, the text shows that the writer is intending to meet or challenge conventional expectations in rhetorically effective ways, which means these references to Scripture might also serve to connect with the audience on a deeper moral level or provide a common ground for his arguments.