How does Zacchaeus' story illustrate the concept of effectual calling?

The story of Zacchaeus vividly exemplifies effectual calling. When Jesus called Zacchaeus, He did so personally, showing that the call to salvation is not only universal but also individual and specific. Zacchaeus, despite his stature and status as a sinner, responded immediately and joyfully to Jesus' call (Luke 19:5-6). This reflects the nature of effectual calling, where the grace of God effectively brings about a response from the sinner, transforming their heart and leading them to receive Christ. Zacchaeus' quick and joyful response underlines the irresistible nature of God's grace at work in the elect's hearts.