17 The word of God, which is the power of God for the salvation of all who believe (see Rom. 1:16), is set forth and shows its power in a most excellent way in the writings of the New Testament. For when the fullness of time arrived (see Gal. 4:4), the Word was made flesh and dwelt among us in His fullness of graces and truth (see John 1:14). Christ established the kingdom of God on earth, manifested His Father and Himself by deeds and words, and completed His work by His death, resurrection and glorious Ascension and by the sending of the Holy Spirit. Having been lifted up from the earth, He draws all men to Himself (see John 12:32, Greek text), He who alone has the words of eternal life (see John 6:68). This mystery had not been manifested to other generations as it was now revealed to His holy Apostles and prophets in the Holy Spirit (see Eph. 3:4-6, Greek text), so that they might preach the Gospel, stir up faith in Jesus, Christ and Lord, and gather together the Church. Now the writings of the New Testament stand as a perpetual and divine witness to these realities.
Source: Dei Verbum (Vatican.va)