Be perfect as your heavenly Father is perfect
You have learnt what is said: Love your neighbor and hate your enemy
In fact the Law required love of neighbor but allowed freedom to hate ones enemy. Faith demands that we love our enemies. By means of a universal feeling of charity it breaks the movements of violence in mans spirit, not just by restraining its vengeful anger but even more by pacifying it to the point of making us love those in the wrong. To love those who love you belongs to the pagan and we all have an affection for those who show it to us themselves. So Christ is calling us to live as children of God and imitate Him who, through the coming of his Christ, gives sun and rain to the good and the guilty alike in the sacraments of baptism and the Spirit. In this way he forms us according to the perfect life by means of this bond of kindness to all by calling us to imitate a heavenly Father who is perfect.