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

Effectual calling is the theological concept that God's call to salvation cannot be resisted. Jesus' encounter with the demon-possessed man in Mark 1:25-26 illustrates this principle effectively. When Jesus commanded the unclean spirit to come out, the spirit obeyed without resistance. This reflects the irresistible grace of God when He calls individuals to Himself. The constant theme in Scripture is that God’s word accomplishes its purpose and does not return void (Isaiah 55:11). Thus, when God calls a person, it leads to transformation and new life, confirming the truth of this doctrine.