In the opening homily of Pope John Paul II's visit to Poland, he said the struggle against the sin and the culture of death must take place first in our own lives, then in the world around us, through love.
Dear brothers and sisters, do not let yourselves be “frightened in anything by your opponents,” as Paul tells us in the First Reading. Do not let yourselves be intimidated by those who point to sin as the way to happiness. You are “engaged in the same conflict which you saw and now hear to be mine” (Philippians 1:30), adds the Apostle to the Nations.
This is the struggle against our personal sins and especially sins against love: these can take on disturbing dimensions in the life of society. Man will never be happy at the expense of another man, destroying his freedom, trampling people's dignity and cultivating selfishness.
Our happiness are our brothers and sisters, whom God has given to us and entrusted to us, and through them, our happiness is God himself. For “he who loves is born of God and knows God, for God is love” (1 John 4:7-8).