We are weak, limited and frail.  Where can we find the strength to endure until the end, to accomplish the great task that Jesus has given to us to go into all the world, teaching disciples to obey all that Jesus has commanded us?  We are desperately dependent on God alone for both our justification and our sanctification.  God guarantees the success of the mission because he guarantees that his presence will go with us.  We find comfort in the powerful, personal presence of our Savior.