Remember that the Bible is really a collection of smaller books and letters written by around 40 different authors. These were written over a period of about 1500 years.
The only way that such a span of writing could maintain internal consistency is by being a supernaturally guided production. Every author was moved by the Spirit to write what was written. As such, the whole Bible makes sense with every other part of the Bible. When it doesn't seem to match up, it usually means the reader has missed something.
Some claim that there are too many contradictions in the Bible for it to be supernatural. If only they would take the time to understand the fullness of the context in which their "contradiction" was written. Then they might see their objection melt away.
Introduction to Bible Difficulties and Bible Contradictions
(follow the links on the left to find how specific contradictions are resolved at www.carm.org)