I was struck by the sloppiness of "apologist" Greg Koukl's handling of Scripture when trying to argue against the sufficiency of Scripture. How he dealt with 2Tim. 3:16 was of particular interest to me. He states:
"Bible only" advocates rely on a handful of references to prove that Scripture provides the sole solutions to life's problems. These three are characteristic...
(Consider this: Koukl has a low view of Scripture and so he must attack its inspiration and sufficiency in order to adhere to Natural Theology. (On the contrary, not all truth is God's truth; also go here for an excellent treatment of this notion. ))
Here is what faithful pastor-teacher John MacArthur said on the inspiration and sufficiency of Scripture in his sermon on "False Prophets and Lying Tongues":
It is profitable to give you the necessary body of divine truth to live a godly life. That's what he's saying. The Bible provides for you what Paul calls to Timothy the deposit. It gives you the truth, the deposit of truth to be guarded, 1 Timothy 6:20 and 21, 2 Timothy 1:13. It is God's revelation of truth. And it provides for you the substance to be believed...doctrine, the body of content upon which...mark this carefully...every thought and every action is to be built. Did you get that? The Bible provides for us the body of truth upon which every thought and every action is to be built. So it is profitable for content. It gives us the truth. John 17:17, "Thy Word is truth." If you're looking for a foundation to build your life on, it is this book. It provides the principles that are to operate in the life of every individual at every point of need and demand, thought and action. It's comprehensive. Every single thing you will ever deal with in your spiritual existence is covered one way or another in the Scripture, probably many more than just one time. It is replete with instruction for life...life in the way that God has designed it."
I Corinthians, Chapter 2, verse 9: "Eye, hath not seen..." You can't discover truth by empiricism ‑‑"...nor ear heard, neither have entered in the heart of man..." You can't discover truth by rationalism. "...the things that God has prepared for them that love Him." "But God has revealed them unto us by His Spirit." The Spirit is the one who searches the deep things of God. Science ‑ that's empiricism. Philosophy ‑ that's rationalism. According to 1 Cor. 2:9, neither of them will ever discover ultimate truth.
The historian Schlatter says, "Everything that had to do with theories about God and the world and the meaning of human life was called `philosophy' at that time, not only in the pagan schools but also in the Jewish schools of the Greek cities." He is saying that the term philosophy was used of every single theory about God and the world in that era. It was the common term. So, anyone who had any new theory about God, or any new theory about the world--its origins, its meaning, and its destiny--was considered a philosopher with a philosophy.
Jas 4:4 You adulterous people! Do you not know that friendship with the world is enmity with God? Therefore whoever wishes to be a friend of the world makes himself an enemy of God.
Jas 4:6 But he gives more grace. Therefore it says, "God opposes the proud, but gives grace to the humble."
1Ti 6:20 O Timothy, guard the deposit entrusted to you. Avoid the irreverent babble and contradictions of what is falsely called "knowledge," 21 for by professing it some have swerved from the faith. Grace be with you.