The word of God has the power to change a person and to enable him to walk in the position that God intends for him to walk in, which is a position of living like and doing things like God as his sons and daughters (Ephesians 5:1). Knowing and meditating in his word makes us walk in the full manifestation of his sons and daughters. Meditating in his word is different from reading his word. Reading is looking at the letters and understanding that which is written there. But meditating in the word is making the word a part of your life. Meditating takes reading carefully, thinking over and over and speaking that which you read with your mouth. It takes repeating over and over that which you read until it is part of your spirit. And when the truth of the word of God is part of your spirit, it is only then that, that truth will be manifested in your physical life. The word of God will produce results in your life only if it is in your spirit, not only in your soul/ mind. And what makes the word to become part of your spirit is regular meditation in it. And when it is in your spirit and you speak it with your mouth, then it will bring the changes and results that you expect.