My anger is mostly at myself, because I want them to understand so badly it hurts, and I sometimes feel that perhaps I am not doing enough, or not explaining it well enough.  I understand how Jesus must have felt, though, now, when He said in many of His parables, "Let him who hath ears to hear, hear."  There will always be those that simply refuse to hear.  They are like the seed cast upon the stone.  It never takes root, but rather, dries up and dies.