How do we know God's calling is effectual?

God's calling is not a mere suggestion or invitation; it is an effectual command that changes the hearts and minds of those who receive it. As seen in the calling of the disciples in Mark 1:16-20, when Jesus called Peter, Andrew, James, and John, they immediately left their nets and followed Him, demonstrating their transformation and earnest response. This effectual call indicates that when God calls someone, He empowers them to respond in faith and follow Him. In essence, it is God's work, not ours, and it proves His sovereign grace in action. The assurance of God's effectual calling is also rooted in Scripture passages like Romans 8:30, which confirms that whom He calls, He justifies.