Joshua 1:8 NKJV
This Book of the Law shall not depart from your mouth, but you shall meditate in it day and night, that you may observe to do according to all that is written in it. For then you will make your way prosperous, and then you will have good success.
God told Joshua that speaking and studying the teachings of the Lord for the purpose of living by them would bring him good success. There are many people that the world calls successful. However, not all success is good success. Satan offered Jesus success if Jesus would fall down and worship him. Those who have bowed their knee to Satan in order to be successful have been very disappointed. Some have actually attained huge success by worldly standards, but it has been bad success – success that cost them their marriage, family, peace and/or health. God can only offer good success because He is all good, and His Word is all good. Everything He tells us to do is good. Everything He offers us is good. So we need to cooperate with Him for our own good.