Jesus' mandate to his disciples is to travel lightly and keep moving. Nowhere do we see him sitting down with the twelve and a map, or a snakebite kit, or a store of provisions, or a feasibility study, or a specific set of "goals,""strategies" and "objectives." Jesus gives the disciples only what they need most: a mission and the authority to carry it out. All he recommends they take in addition to this is a walking stick a personal goad to keep them moving when the terrain gets rough or when they get weary.
Today we would never dream of starting on such a significant journey without what we now envision as "adequate provisions." Yet for all our carefully considered plans, it is doubtful that we are ever as prepared as either David or the disciples for what the future may offer. David was prepared through his willingness to sit before the Lord in prayer. The disciples were prepared through their certainty that they went out with the matchless authority of Jesus.