Reuben Walter emphasizes that Jesus calls Christians to be 'game changers' in society, urging them to live radically different lives that reflect His teachings. He highlights the importance of loving enemies, forgiving without conditions, and embodying the principles of the Kingdom of Heaven, which are contrary to human nature. Walter explains that true change comes not from sheer determination but through the power of the Holy Spirit, enabling believers to break free from bitterness and self-pity. He stresses that Christians must shine their light brightly in a dark world, demonstrating a love that surpasses worldly expectations. Ultimately, Walter encourages believers to embrace their calling to reflect Christ's love and mercy, which can lead others to seek God.