The weapons of our warfare ...have divine power to destroy strongholds. 2 Cor. 10:4
"I'm not the greatest; I'm the double greatest. Not only do I knock 'em out, I pick the round."
Thus were the words of famed boxer Muhammad Ali. He may have been a pompous jerk, but there was no doubting the fact that he was a powerful force to be reckoned with in the ring. Once you came face to face with the heavyweight champion, you knew that power first hand.
When it comes to the Bible, we can apply Ali's words more directly. Scripture isn't just the greatest; it is the double greatest. There is not one book that can compare with its power. It has a supernatural force that penetrates deep and powerfully moves upon the souls of men. No book can compare with its ability to convict, convert, and built up.
The gospel is the power of God for salvation. The Word of God is living and active, able to pierce down to the innermost parts of the soul. Its nature is to revive, delight the heart, enrich, and suppress evil. For those who are not redeemed, it is the fragrance of death. For those who are unregenerate, it acts like chains that restrain the heart from acting out.
Read anything. Read a novel; the best one you can find. Make it a classic; one that has stood the test of time and been commended by the masses of humanity. Then read the Bible. You will find that while the former may be entertaining, persuasive, informative, or enlightening. It may move you to laugh, cry, or leave you wanting more at the end. But it will not have the same effect as the Bible.
The Scriptures, being divine in nature, have spiritual vitality. They exert a power over you that will either anger or agitate you, or comfort and encourage you.
Perhaps you've had just such an experience. You've had different literature that you've read for a certain amount of time. It actually took over for your devotional reading of Scripture. You enjoyed the reading. You were drawn back to it again and again.
But then you took up the Scriptures. As you read it, you could tell that there was something different about it. It had an impact that was much more significant. It "spoke" to you in a deeper fashion than the other book.
Or perhaps it was the other way around. I've found in my passing out of gospel tracts that more people become intently angered over that little slip of paper than anything else in the world. If I had given them a copy of the Book of Mormon or the JW's Watchtower, they'd probably never would have batted an eye. But since it was God's Word on that paper, it spooked them.
That is a testimony of the inherent power of God's Word. It has an efficacy that goes far beyond all human books. It doesn't just tickle the mind; it touches the soul.
Because we can see and feel the Spirit working by it we can understand that it comes from the Spirit.