In Life in Christ Raniero Cantalamessa, preacher to the papal household, presents a project of re-evangelization and spiritual renewal based on St. Paul's Letter to the Romans. It is therefore neither an exegetical commentary nor a theological treatise, but goes straight to the heart of what animated the Apostle when he wrote this letter. His aim was not to give the Christians of Rome—and the Christians of later generations—a difficult text on which to exercise their critical wisdom but rather to impart a spiritual gift to them so that they would be strengthened and mutually encouraged by each other's faith.
At the beginning of the third millennium a new phenomenon is spreading through the Christian Churches which can only be the work of the Holy Spirit. Up to now Christians of different denominations have proclaimed Jesus Christ mainly in competition and rivalry with one another, thus compromising our testimony in the eyes of the world. Why should we not grasp this unique occasion to start proclaiming together with brotherly love our common belief in Christ, which is far more important than what still separates us? Pope John Paul II has espoused this project and has expressed the wish that all Christians take this opportunity "for fruitful cooperation in the many areas which unite us; these are unquestionably more numerous than those which divide us."

Life in Christ is a contribution to the realization of this project. Father Cantalamessa has made the most of the insights and riches present in each one of the three main Christian traditions: Catholic, Orthodox, and Protestant, avoiding those points not commonly shared by all believers in Christ, or at least by the majority of them. The Letter to the Romans lends itself to this aim because it deals with the basics of the Christian faith, leaving all the rest aside. It is the ideal basis for that "Common Witness" which is becoming more and more central to ecumenical dialogue. This is, therefore, a first and "partial" attempt to present a spirituality and a proclamation corresponding to the new grace of understanding and unity given to the Christians in the second half of this century.