Why is it important for Christians to focus on their own spiritual growth?

Focusing on individual spiritual growth is crucial for Christians as it allows them to follow Christ's call authentically. When Peter questions what will happen to John, Jesus redirects him by stating, 'Follow thou me.' This highlights the need to concentrate on one's path and service to God rather than comparing it with others. In John 21, Jesus emphasizes that each believer has a unique calling and purpose in His plan, underscoring the importance of loving, learning, and following Him directly.