2 Timothy 3:16-17 

All Scripture is God-breathed and is useful for teaching, rebuking, correcting and training in righteousness, so that the man of God may be thoroughly equipped for every good work. 

"All", 'thoroughly", "every" - absolute. All Scripture comes from God; all of it is useful. The purpose of Scripture here shown is that we may be thoroughly equipped for every good work. Good works as mentioned in the Bible have a whole lot of meanings.. 1) Good done to people (Galatians 6:9-10) - helping them, being there for them etc. 2) In Philippians 1:6, good work is used to mean the transformation work that God is doing in our lives. "he who began a good work in you will carry it on to completion until the day of Christ Jesus." Through Scripture we can be taught, rebuked, corrected etc. and when we realize our faults, we make the decision to allow God to do His transforming work in our lives. Yep. 

Ephesians 2:10 - For we are God's workmanship, created in Christ Jesus to do good works, which God prepared in advance for us to do. =) We are created in Christ Jesus to do good works, and Scripture is like that "so that" we may be equipped. We aren't saved by works, but we are saved to do good works. And whoa. God created us, He gave us a new life, AND He gave us His Word to live by, His instructions. "so that". God's provision of His Word didn't end with the "oh it can give us guidance" part. There's a "so that" after that. =) Aiyo I don't really know how to put it into words leh, hope you guys can understand what I wrote.. whoops.

Oh and... Was reminded of Isaiah 55:10-11 - As the rain and the snow come down from heaven, and do not return to it without watering the earth and making it bud and flourish, so that it yields seed for the sower and bread for the eater, so is my word that goes out from my mouth: it will not return to me empty, but will accomplish what I desire and achieve the purpose for which I sent it. =)