How do we know that Paul was called to be an apostle?

Paul's transformation from a persecutor of the church to an apostle of Christ serves as a powerful testimony of divine calling. He recounts in his letters that he was specifically appointed by Jesus to preach the gospel to the Gentiles. This calling is not self-derived; rather, it is a direct commission from Christ, who chose him while he was actively opposing the church. Paul's identity as an apostle is rooted in this act of grace, showcasing how God calls, equips, and sends individuals according to His purpose and plan.