The book can help us to stay calm, fearful and courageous in the midst of hardship. We come into temptation to sin almost every day but thanks to the Bible we learn to control our emotions and acts. The Bible has a powerful mechanism to rescue us people from darkest thoughts and hopeless situations and return us to the right path.
There is no certain reason why you should read it, it's up to you to decide whether to accept the words of God.