All Scripture is inspired by God and profitable for teaching, for reproof, for correction, for training in righteousness that the man of God may be adequate, equipped for every good work. (2 Timothy 3:16-17)
Inspired means “God breathed.” It is all from God! It is all reliable! It is inerrant and infallible and eternal. It is not inspired by men or demons! All Scripture refers to the Old and New Testaments.
It is Profitable (sufficient, beneficial, and productive). Teaching here speaks of content and not style of teaching. Reproof (carries the idea of rebuking in order to convict of misbehavior or false doctrine. Correction (restore something to its original and proper condition; In Greek literature it was used of setting upright an object that had fallen down or of helping a person back on their feet. Righteousness is godly living.
The Man of God can be a saved person or a preacher or teacher. Adequate refers to people who are complete, capable and proficient in everything they are called to be or do. Every good work means that the believer will be enabled to meet all demands of righteousness. WHEN THE MAN OF GOD IS EQUIPPED BY THE WORD, HE CAN EQUIP THE BELIEVERS UNDER HIS CARE.
Smart men didn’t write the Bible. Human genius didn’t produce it. It is not like Mozart composing, Michelangelo painting or Shakespeare writing. Biblical inspiration is like this: Brethren, the Scripture had to be fulfilled, which the Holy Spirit foretold by the mouth of David (Acts 1: 16). David was not inspired, what he wrote was inspired. He is gone, but his inspired word is still here and just as true as the day he penned it. This is the ultimate verse on biblical inspiration. The mouth is controlled by the mind. God, the Holy Spirit, was the mind and David then spoke or wrote what God inspired through him…David was not inspired, but he was anointed and holy and moved along by the Holy Spirit. This is how a perfect word can come through an imperfect vessel. Think of Mary, a sinner, producing the perfect Son of God without sin. You can’t deify Mary and make her equal to the Son of God as some do. Neither is David equal to Christ nor is any other bible writer. But, what they wrote is as perfect as He is! If man had written the Bible, He would have edited out some of the tensions or seemingly paradoxes: (Sovereignty and human responsibility; Is Jesus God or Man? Who lives your Christian life?).
Daniel Wallace speaking on the reliability of the New Testament in a lecture entitled “Is What We Have Now What They Wrote Then?”