In order to arrive at a systematic knowledge of the content of the faith, all can find in the Catechism of the Catholic Church a precious and indispensable tool. It is one of the most important fruits of the Second Vatican Council.
...the Year of Faith will have to see a concerted effort to rediscover and study the fundamental content of the faith that receives its systematic and organic synthesis in the Catechism of the Catholic Church. Here, in fact, we see the wealth of teaching that the Church has received, safeguarded and proposed in her two thousand years of history. From Sacred Scripture to the Fathers of the Church, from theological masters to the saints across the centuries, the Catechism provides a permanent record of the many ways in which the Church has meditated on the faith and made progress in doctrine so as to offer certitude to believers in their lives of faith.
In its very structure, the Catechism of the Catholic Church follows the development of the faith right up to the great themes of daily life. On page after page, we find that what is presented here is no theory, but an encounter with a Person who lives within the Church. The profession of faith is followed by an account of sacramental life, in which Christ is present, operative and continues to build his Church. Without the liturgy and the sacraments, the profession of faith would lack efficacy, because it would lack the grace which supports Christian witness. By the same criterion, the teaching of the Catechism on the moral life acquires its full meaning if placed in relationship with faith, liturgy and prayer.
Pope Benedict in Porta Fidei 11 & 12