1. Scripture is the authority for believers. The Scriptures are the authoritative word of God because they are based upon the authority of God. Since “All Scripture is breathed out by God…” and “whatever was written in former days was written for our instruction” and “that no prophecy of Scripture comes from someone’s own interpretation” we can trust that Scripture is from God’s authority (2 Tim. 3:16; Rom. 15:4; 2 Pet. 1:20).
Since Scripture is from God to man and not just a book written by men, but a book written by men guided by the Holy Spirit, we can rest in the fact that it is authoritative for us. It is to be our guide in daily living. Granted, it does not explicitly answer every question we have about everything, it does give good guidance and direction for us. We can go to it and trust it because of who it is from.
Since it is from God, and God is “Holy, Holy, Holy is the Lord of hosts; the whole earth is full of his glory” (Isa. 6:3). We can trust it to be exactly what we need in all situations. He has given us what we need it is up to us to utilize it properly and apply it properly.
2. The Scriptures are God’s main means of speaking to us. Through Scripture God teaches us and guides us as we need to be guided. Again, to look back to 2 Timothy 3:16-17 we see that Scripture is, “profitable for teaching, reproof, for correction, and for training in righteousness, that the man of God may be complete, equipped for every good work.”
Backing up a chapter in 2 Timothy we also see this, “Be diligent to present yourself approved to God, a worker who does not need to be ashamed, rightly dividing the word of truth” (2 Tim. 2:15). We know the word of God is truth because previously before this we see where Jesus Christ said in His high priestly prayer for God to, “Sanctify them by your truth. Your word is truth” (John 17:17). Scripture is good for our teaching and learning because it is true and from God and how God has chosen to speak to us now.
Hebrews 1:1-2 tells us that “Long ago, at many times and in many ways, God spoke to our fathers by the prophets, but in these last days he has spoken by his Son….” We see that the Old Testament is summed up by the phrase the Law and the Prophets in a few areas in the gospels (Matt. 5:17; 7:12; 22:36-40). God spoke to these men and they wrote what he spoke and wrote influenced by the Spirit as 2 Peter 1:21 tells us.
Now, in the New Testament, we have men writing things that Jesus said and taught them “These things I have spoken to you while being present with you. But the Helper, the Holy Spirit, whom the Father will send in my name, He will teach you all things, and bring to remembrance all things that I said” (John 14:25-26). With this we know that God has spoken through His Word and by His speaking and guiding men along, we have His word to guide and teach us. We also know that they are the main method of God speaking to us now. I say main because God still has revelation in nature because nature is from God too. In it, He reveals Himself through it and shows He is real, but He speaks clearly to us in His word.