Be Ready for the Gospel of Peace

Ephesians 6:15 tells us that we must have our feet shod with the preparation of the gospel of peace. What exactly does this mean? What about our feet; our preparation or readiness; and the gospel of peace? What is that gospel? Paul warns us not to accept a different gospel, another Jesus, or a different spirit. He also shows us that the belief in the true gospel is absolutely necessary for salvation; and that we ourselves must have peace if we want to stand up for the gospel of peace.