In Exodus 20:1-3, we see God giving important "words" to his people. Now that they were out of Egypt, it was time to get Egypt out of the people. The wilderness wanderings were a reforming time, a reshaping time where the people were physically trained to follow God's direction, but also taught his laws and commandments so that they could become his people, and by extension put his character on display for the cultures around them. Today, this is still God's intention, to make us his people, a kingdom of priests, obedient to the Word made flesh.