Firstly, it reveals God's intention - God wants us to be successful in life. That is why He is giving us the principle for success. It also reveals God's promise, or guarantee, or God's kingdom's operating laws (like the natural laws of gravity), for our success. Do it God's way and you get God's promised result. We can recall Joshua 1:8 - the Book is given that we may prosper. Now we talk about the HOW - the method.
6. A famous preacher rephrased this verse roughly as "Economic Success follows Spiritual Revival". This is definitely supported by the development of Europe and US after the rediscovery of salvation by faith alone.