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.
I've always thought that this (along with the verse in Hosea that I often use for signatures) is one of those verses that folks wished didn't exist. After all, it touches upon a few fundamental cornerstones of faith, which a lot of folks, just don't want to think on.
First and foremost, is the fact that ALL scripture is inspired by God, and is useful for teaching, rebuking, correcting and training in righteousness. This is important, when one considers how few people actually read such things as the Law of Moses.
We, as humans, have a tendency to supplant verses we don't like. We want them to go away, and thus, we forge excuses that we don't have to read and obey them. Statements like "Well, I could never get into Numbers," or "We should never base doctrine on a book about change."
That last one is an actual quote from an elder of a church I once attended when I reminded him that the only book of the Bible in which we get to watch actual conversions of people into Christians was Acts. Said elder did not like large portions of Acts because the descriptions of events did not coincide with the conceits of the church he was an elder for.
This is something that we're all guilty of, in some way or another.
In regards to today's scripture, C.H. Spurgeon wrote:
The Bible is the writing of the living God." He explained that though "Moses was employed to write his histories with his fiery pen, God guided that pen. It may be that David touched his harp and let sweet psalms of melody drop from his fingers, but God moved his hands over the living strings of his golden harp. Solomon sang canticles of love and gave forth words of consummate wisdom, but God directed his lips and made the preacher eloquent. If I follow the thundering Nahum, when his horses plow the waters; or Habakkuk, when he sees the tents of Cushan in affliction; if I read Malachi, when the earth is burning like an oven; or the rugged chapters of Peter, who speaks of fire devouring God's enemies; if I turn aside to Jude, who launches forth anathemas on the foes of God—everywhere I find God speaking. It is God's voice, not man's. (Thoughts for the Quiet Hour).Think about that. The Bible is God speaking. God giving us instructions. God teaching. God rebuking. God correcting. God training us in righteousness. All this, so that we all can do that which He wills.