This sacred Council has several aims in view: it desires to impart an ever increasing vigor to the Christian life of the faithful; to adapt more suitably to the needs of our own times those institutions which are subject to change; to foster whatever can promote union among all who believe in Christ; to strengthen whatever can help to call the whole of mankind into the household of the Church. The Council therefore sees particularly cogent reasons for undertaking the reform and promotion of the liturgy.
For the liturgy, through which, most of all in the divine Sacrifice of the Eucharist, "the work of our redemption is accomplished," ("Liturgia enim, per quam, maxime in divino Eucharistiæ Sacrificio, 'opus nostræ Redemptionis exercetur'": 1 - Secret of the ninth Sunday after Pentecost), is the outstanding means whereby the faithful may express in their lives, and manifest to others, the mystery of Christ and the real nature of the true Church.
Quite a progress for two "progressives"! Cardinal Martini could learn from them.
Martini picture source: Father Blake.