Why did the Holy Father desire the return of the Traditional Latin Mass?
As the Holy Father states at the beginning of Summorum Pontificum , the Mass promulgated by Blessed John XXIII was never abrogated and therefore it was always permissible to celebrate the Extraordinary Form of the Mass. Earlier, Blessed John Paul II allowed this form of the Mass through indult and later encouraged its widespread use (Quattuor Abhinc Anno, 1984; Ecclesia Dei,1988). Then, Pope Benedict, through Summorum Pontificum , allows any priest to celebrate the ancient form of the Mass, makes it clear that other sacraments can be celebrated in the older form, allows for the breviary (the prayers said daily by members of religious orders and priests) to be prayed in the ancient form and encourages that the ancient form be available through personal parishes or chaplains. By allowing for the widespread use of the Extraordinary Form the Holy Father wishes to increase unity with those groups that have separated from the Church because they perceive a rupture with tradition (most notably the Society of St. Pius X), to provide for those who are strongly attached to the ancient liturgy and to help fight liturgical abuses and confusions that have crept into the Ordinary Form.