Why is it significant that believers are not taken out of the world?

In John 17:15, Jesus explicitly prays, 'I pray not that Thou shouldst take them out of the world, but that Thou shouldst keep them from the evil.' This signifies that it is beneficial for believers to stay in the world, as they are called to display Christ's character in the midst of adversity. The world's challenges are integral to the Christian life, promoting growth in grace and maturity in believers. By facing trials and temptations, Christians exhibit the power of God's grace, thus glorifying Christ and witnessing to the lost. The experiences of sanctification in this world are crucial in preparing believers for eternal communion with God. As they endure and overcome evil, believers learn to value their Redeemer more deeply and contribute to the advancement of His kingdom.