If anyone in this world is convinced that he is wise, he should revise his thinking, because "the wisdom of this world is foolishness with God."
It is a perfect introduction to the difficult subject of "love of enemies."
Anger and revenge, which have no moderation, are present at times in our lives. Jesus unequivocally condemns this attitude which for us is difficult.
In Jesus' morality, there is no place for hatred and rejection of our fellow man because by saying "I hate you " does not build anything about the kingdom of God.
Christ is our consciousness in our difficulties in loving our enemies therefore He calls on us "be ye perfect as your Father is perfect."
It is a call to examine ourselves, because what happens to us in our lives cannot be like "double-talk" always able to justify our actions. At home we would call this a small offense or maybe not. We notice that the other man's crimes are worthy of condemnation but maybe we will find it easier to forgive when we see our enemy is the same as we are.
Love is the only way to abolish the ripple effects of evil. When we respond with love and goodness to those who have wronged us we do not sew evil in place of the small grain - the grain which is God's goodness.