CATECHISM OF THE CATHOLIC CHURCH
SECOND EDITION

Paragraphs 182–185

182 We believe all "that which is contained in the word of God, written or handed down, and which the Church proposes for belief as divinely revealed" (Paul VI, CPG § 20).
183 Faith is necessary for salvation. The Lord himself affirms: "He who believes and is baptized will be saved; but he who does not believe will be condemned" (Mk 16:16).
184 "Faith is a foretaste of the knowledge that will make us blessed in the life to come" (St. Thomas Aquinas. Comp. theol. 1, 2).
185 Whoever says "I believe" says "I pledge myself to what we believe." Communion in faith needs a common language of faith, normative for all and uniting all in the same confession of faith.