through whom is God speaking to believers in this age of grace?
In this age of grace, God speaks to believers through the apostle Paul. Paul is the authority through whom God is speaking to the whole human race, and he had to establish that apostleship, especially to the Jewish people who thought he was a renegade to Judaism.
Les explains that Paul had to establish the authority connected to his apostleship to whomever he wrote. For believers in this age of grace, Paul is the authority through whom God is speaking to the whole human race. This was especially important to the Jewish people, who thought Paul was a renegade to Judaism and had turned on his background. The Corinthians also had divisions, with some claiming to follow Paul, others Peter, and others saying they would do what Jesus said rather than what Paul said. Paul continually defended his apostleship.