Source: Gregory Larson

Part Two: the Sacraments of Faith

(15) The second part of the Catechism explains how God’s salvation, accomplished once for all through Christ Jesus and the Holy Spirit, is made present in the sacred actions of the Church’s liturgy (Section One), especially in the seven sacraments (Section Two).

Part Three: the Life of Faith

(16) The third part of the Catechism deals with the final end of man created in the image of God: beatitude, and the ways of reaching it – through right conduct freely chosen, with the help of God’s law and grace (Section One), and through conduct that fulfills the twofold commandment of charity, specified in God’s Ten Commandments (Section Two).

Part Four: Prayer in the Life of Faith

(17) The last part of the Catechism deals with the meaning and importance of prayer in the life of believers (Section One). It concludes with a brief commentary on the seven petitions of the Lord’s Prayer (Section Two), for indeed we find in these the sum of all the good things which we must hope for, and which our heavenly Father wants to grant us.

V. Practical Directions for Using this Catechism

(18) This catechism is conceived as an organic presentation of the Catholic faith in its entirety. It should be seen therefore as a unified whole. Numerous cross-references in the margin of the text (numbers found at the end of a sentence referring to other paragraphs that deal with the same theme), as well as the analytical index at the end of the volume, allow the reader to view each theme in its relationship with the entirety of the faith.

(19) The texts of Sacred Scripture are often not quoted word for word but are merely indicated by a reference (cf.). For a deeper understanding of such passages, the reader should refer to the Scriptural texts themselves. Such Biblical references are a valuable working-tool in catechesis.

(20) The use of small print in certain passages indicates observations of an historical or apologetic nature, or supplementary doctrinal explanations.

(21) The quotations, also in small print, from patristic, liturgical, magisterial or hagiographical sources, are intended to enrich the doctrinal presentations. These texts have often been chosen with a view to direct catechetical use.

Source: Vatican