How do we know that the calling of apostles is true?

The reality of the apostles' calling is substantiated by their unique relationship with Christ, their witness of His ministry, death, and resurrection. Jesus handpicked these individuals, imparting to them authority as seen in Mark 6:7-12, where He sends them out to preach and heal. Their words and writings were divinely inspired, thus forming the foundation of Christian doctrine. Additionally, the miracles and signs they performed served as a divine confirmation of their calling. In Ephesians 2:20, it is affirmed that the church is built on the foundation of the apostles and prophets, with Christ being the cornerstone, illustrating their essential role in establishing God’s revelation.