Why 2 Timothy 2:15?

Why is it so important to "rightly divide" the Scriptures? Why are we told to do so in 2 Timothy 2:15? Ain't OT and NT enough division? How can we accomplish God's will in 1 Timothy 2:4 without "right division"? Have you ever wondered why the books in our Bible are in the order they are in? Job was the first book written and many believe 2 Timothy was the last book written. They definitely aren't organized chronologically. They are organized dispensationally. God is awesome!!!