As followers of Christ, love for others should permeate all we do. Jesus said the greatest commandment was to love God, and the second greatest was to love others as ourselves (Mark 12:28-31). He even took it up a notch when He said the greatest demonstration of love was to lay down your life for another (John 15:12-13). Of course, Jesus would go on to model such love in His sacrificial death for our sins.
Love for others is the central tenet of Christianity. It is the linchpin and the differentiator. Self-sacrificial love begins with surrendering ourselves to Jesus and manifests as we pour out our lives in service to others to the glory of God. You cannot love God and treat others poorly or unfairly. If we love God, we will love others in kind.