The stories of Esau, Jacob, Moses, and Pharaoh that Paul recounts in Romans 9 are used to build the point he began in the chapter with Isaac and Ishmael. Paul uses a key phrase “the purpose of election” this is critical to understanding his entire flow of thought in this passage. We have to understand that phrase.
Moses makes one of the most bold and amazing requests in Exodus 33:18-19. Imagine asking the God of the Exodus who has just crippled the most powerful nation on earth and terrified the nation of Israel with manifestations of His presence that you want to see even more of His glory. What gave Moses this kind of boldness? The answer is found in Exodus 33.