How do we know the doctrine of divine calling is true?

The truth of the doctrine of divine calling is firmly rooted in Scripture, notably in Acts 2:39, where it is declared that the promise of the Holy Spirit is for all those whom God calls. This underscores the theological understanding that salvation is not a matter of human merit but is solely dependent on divine calling and God's sovereign grace. In John 10, Jesus affirms this when He states, 'My sheep hear my voice, and I know them, and they follow me.' Thus, the assurance of this calling reveals God's intention to save those whom He has chosen.