The central message of this sermon is that true peace, both with God and within oneself, can only be achieved through surrendering to Jesus Christ. This surrender involves recognizing our own spiritual state as being at war with God due to our imperfections, and acknowledging that we cannot match up to God's perfect standards on our own. It requires an unconditional surrender of ourselves to Jesus Christ, who represents God's perfection, and accepting the benefits of his blood to bring us peace with God. The sermon emphasizes that this peace is not something we can achieve through works or circumstances, but rather it is a gift available to those who put their faith in Christ.