Moses left Egypt and his Hebrew when he went to Midian. There he met Jethro, his future father-in-law. Moses had to step out of Egypt and he had to step away from the Hebrews in order to become educated without their influence. Jethro, as priest of Midian was able to aid and encourage this education. Moses would then be able to go back to Egypt speak justice with righteousness.
This same concept holds true in the church. If we want to be effective in the world today, we have to have a biblical worldview in order to speak into both the world and the church world (Egypt and Hebrews).