The above text instructed Joshua in how to be prosperous and successful. The key was to meditate day and night on the Word of God. To meditate means to contemplate, to think about, to consider, to reflect on. Joshua and the nation of
Israel were to focus their thoughts and actions at home (by night) and at work (by day) on God's revelation. Every action, every thought, every decision, and every problem was to be filtered through the values and principles of God's revelation to insure alignment with the character, nature, and purpose of God. Living this way was the key to success and prosperity.