2Pet 3, 15-16 There are some things hard to understand

(2Pet 3, 15-16) There are some things hard to understand
[15] And consider the patience of our Lord as salvation, as our beloved brother Paul, according to the wisdom given to him, also wrote to you, [16] speaking of these things as he does in all his letters. In them there are some things hard to understand that the ignorant and unstable distort to their own destruction, just as they do the other scriptures.

(CCC 121) The Old Testament is an indispensable part of Sacred Scripture. Its books are divinely inspired and retain a permanent value (Cf. DV 14), for the Old Covenant has never been revoked. (CCC 123) Christians venerate the Old Testament as true Word of God. The Church has always vigorously opposed the idea of rejecting the Old Testament under the pretext that the New has rendered it void (Marcionism). (CCC 124) "The Word of God, which is the power of God for salvation to everyone who has faith, is set forth and displays its power in a most wonderful way in the writings of the New Testament" (DV 17; cf. Rom 1:16) which hand on the ultimate truth of God's Revelation. Their central object is Jesus Christ, God's incarnate Son: his acts, teachings, Passion and glorification, and his Church's beginnings under the Spirit's guidance (Cf. DV 20). (CCC 125) The Gospels are the heart of all the Scriptures "because they are our principal source for the life and teaching of the Incarnate Word, our Saviour" (DV 18). (CCC 85) "The task of giving an authentic interpretation of the Word of God, whether in its written form or in the form of Tradition, has been entrusted to the living teaching office of the Church alone. Its authority in this matter is exercised in the name of Jesus Christ" (DV 10 § 2). This means that the task of interpretation has been entrusted to the bishops in communion with the successor of Peter, the Bishop of Rome. (CCC 87) Mindful of Christ's words to his apostles: "He who hears you, hears me" (Lk 10:16; cf. LG 20), the faithful receive with docility the teachings and directives that their pastors give them in different forms.