Today there are many attacks on the truth of the Bible. There's the frontal attack of liberals who deny it is true. There's the attack from the rear by those who want to substitute their own experience over the Word of God, saying, "Well, I know what I feel or think." Sometimes they'll even argue, "I don't care what the Bible says. Let me tell you what I experienced." And there's an attack from the flank by people who don't necessarily deny the Bible but want to replace it or prop it up with psychology, philosophy, or other things—as if the Bible itself were not good enough.
But if you're looking for truth, you can find it in the Bible. Why? 2 Timothy 3:16 says, "All scripture is given by inspiration of God." In Greek, that word "inspiration" literally means "God-breathed." Jesus said in Matthew 4:4, "Man shall not live by bread alone, but by every word that proceeds from the mouth of God."
Every word comes from God. He did not simply breathe upon the writings of men such as Isaiah, Jeremiah, Matthew, Mark, and Paul, making their words His own. They held the pen of God. They were His instruments as He spoke, breathing the Scriptures out. Therefore, the Bible is true, because the God of truth cannot speak error.