The Gospel of Jesus Christ is not a private opinion, a remote spiritual ideal, or a mere program for personal growth. The Gospel is the power which can transform the world! The Gospel is no abstraction: it is the living person of Jesus Christ, the Word of God, the reflection of the Father’s glory (Cf. Hebr. 1: 2), the Incarnate Son who reveals the deepest meaning of our humanity and the noble destiny to which the whole human family is called (Cf. Gaudium et Spes, 22). Christ has commanded us to let the light of the Gospel shine forth in our service to society. How can we profess faith in God’s word, and then refuse to let it inspire and direct our thinking, our activity, our decisions, and our responsibilities towards one another?
--John Paul II, Baltimore, 8 October 1995
The Gospel is not a private opinion
So let us lift our gaze upward! And with great humility and confidence, let us ask the Spirit to enable us each day to grow in the holiness that will make us living stones in the temple which he is even now raising up in the midst of our world. If we are to be true forces of unity, let us be the first to seek inner reconciliation through penance. Let us forgive the wrongs we have suffered and put aside all anger and contention. Let us be the first to demonstrate the humility and purity of heart which are required to approach the splendor of God’s truth. In fidelity to the deposit of faith entrusted to the Apostles (cf. 1 Tim 6:20), let us be joyful witnesses of the transforming power of the Gospel!
(Benedict XVI, Homily, Votive Mass for the Universal Church, Saint Patrick's Cathedral, New York, 19 April 2008)