I think this sums up a great deal of the Holy Father's understanding of evangelisation, it is from yesterdays Angelus talk
Mary is the incomparable model of evangelization, she who did not communicate an idea to the world but rather Jesus, the incarnate Word. Let us invoke her with confidence so that also the Church in our time proclaims Christ the Savior. Every Christian and every community feels the joy of sharing with others the good news that God so loved the world to give his only begotten Son so that the world might be saved through him. This is the authentic meaning of Christmas, that we must always rediscover and live intensely.