How could faith so small as a mustard seed make a difference?  After the Lord tells of what such an amount of faith can do, he relates an account of a master and a servant.  It is expected that the servant will wait on the master, no matter how weary the servant is.  So, too, we are to continue to follow the Lord, no matter our trials.  We do no ask for a reward, for this is what is expected of us.  Let us nurture our seed of faith so it grows until we are ready for heaven.