I treasure 2 Timothy 2:15-21. I cannot say that it is a more valuable section of scripture than any other, but it is certainly one that has greatly affected me
This text teaches us all that life on earth is not a script which we meaninglessly follow. Instead, life on earth is a time of deciding whether we will live for God or not, and then living out what we have decided. Since God will examine what kinds of workers we have been for Him, we should build our lives on His Word and build His Word into our lives. God's Word alone tells us how to live for Him and serve Him. Believers who ignore the Bible will certainly be ashamed at the judgment. To avoid that shame we must be consistent and diligent students of God's Word, or else we will be lulled into neglecting a relationship with God.
That is our true purpose for living.