In this passage Ephesians 4:1-7 Paul lists 4 attitudes which as believers will bind us together. He then gives 7 key truths upon which believers are unified and made one.

Remember before Paul wrote that he was writing from prison. Remember he said that
he was a prisoner of Jesus. Never did he consider himself a prisoner of Rome because
he always realized that God was sovereign in his life. He then tells us to walk worthy of
our calling. We each have a calling. That is our purpose for living. Humans get into all
kinds of trouble when they have no purpose. We have to have. Purpose. The world
teaches that we are just random cells that just happen into being. We have no purpose
maybe other than just being as happy as we can be.

the tie that binds