Balaam's Donkey
The point: Ministers should make the maintenance of their power in the pulpit their great concern, recognizing that the erosion of this conviction has led to shoddiness in preaching and ministerial training.
The example of God opening the mouth of a dumb ass to speak to a mad prophet is used to illustrate that while God can use any means, His ordinary primary method for calling out His own is through sent preachers.
That God can and does use the humble witness and testimony of any of us. Of his children and even of non-Christians to bring people to repentance and faith. If he can open the mouth of a dumbass to be an effectual mouthpiece to a mad prophet, God can open the mouth of a rational creature. But as an ordinary means, God's primary method of calling out his own is through those who preach as those who are sent.
7:26 - 8:01 Read in full sermon