In a world of many religions most people never read "all" of God's Word. They should because Bible Truths may not match what they believe.
2 Timothy 3:16,17 All scripture is given by the inspiration of God and is profitable for doctrine, for reproof, for correction, for instruction in righteousness: That the man of God may be perfect, thoroughly furnished unto all good works.
We find these characteristics in the New Testament Epistles.
DOCTRINE: The book of Romans tell us that a man is not justified before God by the works of the law, but by faith in Jesus Christ.
REPROOF: 1-2 Corinthians tells us to keep the Passover by purging the leaven of sin from our lives.
CORRECTION: Galatians helps us return to the pure gospel of Jesus.
INSTRUCTION IN RIGHTEOUSNESS: Ephesians to Colossians instructs us to put off the old man and put on the Lord Jesus Christ.
Let the Holy Spirit teach you truth in all scripture.