I am imagining the excitement of those closest to Jesus. Those who have been with him from the very start of his ministry, now witnessing the multitudes crowding in to get close to this miraculous man. And the Master, recognizing the shear numbers, knows he needs help and it's time to up the disciples game. 

 He calls them to join him up on a mountain, and he takes these twelve followers and ordains them to preach the message to the masses and heal them as well. This transformation happens on a mountain because it takes a heightened (reborn) state consciousness to effectively walk His walk. 

 It says elsewhere that 'many are called but few are chosen', and seems here that what differentiates the two is the willingness to climb up to that elevated state of humble receptivity and be ordained by the experience, by the touch, of the Christ. 

 The job of the chosen, going forward is to find time everyday to climb the mountain so to listen for the 'still small voice', to say yes to the call, by stopping and being still for a few moments and then 'going forth and doing likewise' in whatever situations they encounter. A simple idea, yet challenging in application, we press on.