Paul has been telling Timothy that people will speculate about the truth and believe wrong things about the truth. People will argue about the truth. People will be haters of the truth, and oppose the truth. He tells Timothy to continue on in the truth.
“All Scripture is given by inspiration of God, and is profitable for doctrine, for reproof, for correction, for instruction in righteousness, that the man of God may be complete, thoroughly equipped for every good work.” (2 Timothy 3:16-17)
3 important points directly from this passage are:
1. All Scripture Is Given By Inspiration of God. All sacred scripture is described as having been “given by inspiration of God.”
Therefore Timothy (and those of our time who read and study the Bible) can know that our time is well spent. We are not reading the words of mere men, but the very words of God, “breathed out” by Him.
2. All Scripture Is Profitable. Profit may be derived from spending time with the books of the Bible. The Bible was written to be “profitable” for Timothy and for us.
God breathed out his Scripture that we might be profited in the areas of teaching, correction, and instruction in righteousness. The Bible provides us with spiritual guidance which is “profitable.”
3. That The Man of God May Be Complete. To do something you must have the right tools. Paul says that in sacred Scripture we are supplied with the tools that fill our tool box up, supplying us with just the right appliance for every occasion of need.
Read and study your Bible regularly, to learned to use the tools with which we have been supplied. We have all we need. It is just that some of us have not learned to use the tools we already have.