The following are a few scriptural reasons that we should consider when answering this question

 

The Bible is an incredible book of history and facts that proves that there is a God that created all things. Most importantly, the Bible is the Word of God. It contains the mind of God and His will for each one of us. According to Paul that is why the Bible was given to us.

 

Every scripture is inspired by God and useful for teaching,

for reproof, for correction,

that the person dedicated to God

may be capable and equipped for every good work.

~ 2 Timothy 3:16-17

 

First, the Word of God is infallible. There is no error in God's Word. The law of the Lord is perfect concerning our soul. The testimony of the Lord is not only infallible it is faultless.

 

Every word of God is purified;
he is like a shield for those who take refuge in him.
6 Do not add to his words,
lest he reprove you, and prove you to be a liar.

~ Proverbs 30:5-6

 

Second, the Word of God is complete. The Bible does not need any new chapters or verses. It is all given to us already. All you need is God's Word because it is the holy Word of God. It is complete.

I testify to everyone who hears the words of the prophecy contained in this book:

 

If anyone adds to them, God will add to him the plagues described in this book. 

And if anyone takes away from the words of this book of prophecy,

God will take away his share in the tree of life

and in the holy city that are described in this book.

~ Revelation 22:18-19

 

Third, the Word of God is totally authoritative. The Word of God is the only source for absolute divine authority. This divine authority is for you and me as servants of Jesus Christ. When some say, "I have a word from the Lord for you," write it down and as you study God's word see if the Lord speaks to you through His Scriptures. Only then will you know if the Lord is truly speaking to you.

O Lord, your instructions endure;
they stand secure in heaven.

~ Psalm 119:89

 

Fourth, God's Word is totally sufficient for all of our needs. We don't need anything else.  We Christians can be totally secure in the Lord by studying the Bible because it is God's plan for our life.

 

The law of the Lord is perfect
and preserves one’s life.
The rules set down by the Lord are reliable
and impart wisdom to the inexperienced.

~ Psalm 19:7

 

And fifth, the Word of God will accomplish what it promises. If God told you something will happen, and you wait, it will happen. God sent His word to accomplish His perfect will in our lives. If God makes a promise to you, He will fulfill it in His own time. There are so many promises given to us in the Bible. These promises reassure us and bring comfort to our lives in our times of trial. Take time to study the Word of God. The Lord will show you wonderful things that will change your life.

In the same way, the promise that I make
does not return to me, having accomplished nothing.
No, it is realized as I desire
and is fulfilled as I intend.”

~ Isaiah 55:11