When considering the Bible

The Bible is the authoritative Word of God 

“For this reason we also constantly thank God that when you received the word of God which you heard from us, you accepted it not as the word of men, but for what it really is, the word of God, which also performs its work in you who believe.” (1 Thess. 2:13 NASB)

“For prophecy never had its origin in the human will, but prophets, though human, spoke from God as they were carried along by the Holy Spirit.” (2 Pet. 1:24 NIV)

“Paul also wrote to you according to the wisdom given him, as he does in all his letters when he speaks in them of these matters. There are some things in them that are hard to understand, which the ignorant and unstable twist to their own destruction, as they do the other Scriptures.” (2 Pet. 3:15-16 ESV)

The Bible is God Breathed and useful for training in righteousness 

“…from infancy you have known the Holy Scriptures, which are able to make you wise for salvation through faith in Christ Jesus. All Scripture is God-breathed and is useful for teaching, rebuking, correcting and training in righteousness, so that the servant of God may be thoroughly equipped for every good work.” (2 Tim. 3:15-17 ESV) 

Therefore…

“For the word of God is alive and active. Sharper than any double-edged sword, it penetrates even to dividing soul and spirit, joints and marrow; it judges the thoughts and attitudes of the heart.” (Heb. 4:12 NIV)

“Do not merely listen to the word, and so deceive yourselves. Do what it says.” (James 1:22 NIV)

“Until I come, devote yourself to the public reading of Scripture, to exhortation, to teaching."  (1 Timothy 4:13)

“The grass withers and the flowers fall, but the word of our God endures forever.” (Isa. 40:8 NIV) 

Quotes:

“The Word of God I think of as a straight edge, which shows up our own crookedness. We can’t really tell how crooked our thinking is until we line it up with the straight edge of Scripture.” - Elisabeth Elliot

“Unless we form the habit of going to the Bible in bright moments as well as in trouble, we cannot fully respond to its consolations because we lack equilibrium between light and darkness.” - Helen Keller

“The Word of God well understood and religiously obeyed is the shortest route to spiritual perfection. And we must not select a few favorite passages to the exclusion of others. Nothing less than a whole Bible can make a whole Christian.” - A.W. Tozer