We are sent to the world in the same was as the Father sent Jesus from heaven to earth. To truly preach the gospel is to proclaim the cross of Christ while you're hanging on it! The only way you can do that is if you completely trust that your Father will not abandon you. What will your feet look like at the end of your life? Will it be a clean pair that was hidden under the ground, or a dusty pair that has traveled your "world" for the sake of the gospel?