Definition and Overview:
Rejection by the world refers to the experience of being dismissed, marginalized, or persecuted by secular society due to one's faith in Jesus Christ and adherence to Christian principles. This concept is deeply rooted in the teachings of the New Testament, where believers are often reminded that their allegiance to Christ may set them at odds with worldly values and systems.

Biblical Foundation:
The theme of rejection by the world is prominently addressed in the New Testament. Jesus Himself warned His followers about the inevitability of such rejection. In John 15:18-19 , Jesus states, "If the world hates you, understand that it hated Me first. If you were of the world, it would love you as its own. Instead, the world hates you, because you are not of the world, but I have chosen you out of the world."

The Example of Christ:
Jesus Christ is the ultimate example of rejection by the world. Despite His message of love, redemption, and truth, He faced opposition from religious leaders and was ultimately crucified. Isaiah 53:3 prophetically describes Him as "despised and rejected by men, a man of sorrows, acquainted with grief." His life and ministry exemplify the reality that living in accordance with God's will often leads to conflict with worldly powers.

The Apostolic Experience:
The apostles and early Christians also experienced rejection and persecution. The Book of Acts records numerous instances where the apostles faced hostility for preaching the gospel. In Acts 5:41 , after being flogged for their testimony, the apostles "left the Sanhedrin, rejoicing that they had been counted worthy of suffering disgrace for the Name."

Theological Implications:
Rejection by the world is not merely an unfortunate consequence of faith but is often seen as a mark of true discipleship. In 1 Peter 4:14 , believers are encouraged, "If you are insulted for the name of Christ, you are blessed, because the Spirit of glory and of God rests on you." This perspective underscores the belief that suffering for Christ is a participation in His sufferings and a testament to one's faithfulness.

Practical Considerations:
Christians are called to respond to rejection with grace and perseverance. Romans 12:14 advises, "Bless those who persecute you. Bless and do not curse." This response is rooted in the understanding that ultimate vindication and acceptance come from God, not the world. Believers are encouraged to maintain their witness and integrity, trusting in God's justice and reward.

Eschatological Hope:
The New Testament assures believers that rejection by the world is temporary and will be rectified in the eschaton. Revelation 21:4 promises a future where "He will wipe away every tear from their eyes, and there will be no more death or mourning or crying or pain, for the former things have passed away." This hope sustains Christians as they navigate the challenges of living counter-culturally in a fallen world.

Conclusion:
Rejection by the world is a significant aspect of the Christian experience, reflecting the tension between the kingdom of God and the kingdom of this world. It serves as a reminder of the believer's identity in Christ and the call to live faithfully amidst opposition.