The bible contains God's Word. As often as we go through it we are reminded of God's promises to us and His purpose for our lives. Going about life without knowledge of the word of God is just like going on a journey to a foreign land you've never visited without a map, or a compass, or seeking direction.
Proverbs 16:9
A man's heart deviseth his way: But the LORD directeth his steps.
God is the only one in the best position to direct our footsteps. He can do this by speaking to us through His Word. God's word is something that we should hold tight unto. How much of God's Word that we have in us determines who much we can resist the enemy and his cohorts whenever the strike because they surely will.
The Bible is not something that should be treated casually. If we see it as just a book then that is how it will serve us. But when we treat it with reverence it will work out wonders for us in ways behind our imagination.