An international group of theologians has been gathered to offer this commentary on the definitive text. The main themes of the Catechism - God, the incarnation, the Holy Spirit, the liturgy, the sacramental life of the Church, sin - are all discussed by writers drawn from theological faculties in Rome, Oxford, London, Dublin, Toronto, Washington DC and elsewhere. Their brief is to enter into a constructive dialogue with the text, drawing attention to its strengths, but equally criticizing its weaknesses. This commentary is intended to serve as a reference work for bishops, priests, theologians and teachers, as well as for anyone who wants a deeper understanding of the stance of Catholic theology at the end of Christianity's second millennium.