Why do Christians view death as gain?

In Philippians 1:21, Paul articulates the profound truth that for believers, 'to live is Christ, and to die is gain.' This gain is understood as severalfold: upon death, believers are liberated from the presence of sin, doubts, and earthly suffering. They experience a perfect union with Christ and are finally free from the trials of this life. In this light, death is viewed not as a defeat but as a victory and an advantageous transition to eternal joy and peace in the presence of God. Such a perspective encourages believers to embrace death with hope rather than fear.