38 Part One Spirit is not fully “understood except by the Spirit’s action” (cf. Origen, Hom. in Ex. 4, 5: PG 12, 320). 138 The Church accepts and venerates as inspired the 46 books of the Old Testament and the 27 books of the New. 139 The four Gospels occupy a central place because Christ Jesus is their center. 140 The unity of the two Testaments proceeds from the unity of God’s plan and his Revelation. The Old Tes- tament prepares for the New and the New Testament fulfills the Old; the two shed light on each other; both are true Word of God. 141 “The Church has always venerated the divine Scrip- tures as she venerated the Body of the Lord” ( DV 21): both nourish and govern the whole Christian life. “Your word is a lamp to my feet and a light to my path” ( Ps 119:105; cf. Isa 50:4).