In Isaiah 50:4 the second Isaiah says, of himself: “The Lord God has given Me the tongue of discipleship, to sustain the weary with a word. ...[and] He awakens My ears to listen as a disciple”. God has given second Isaiah two input devices and one output device. As a disciple of first Isaiah, second Isaiah has his ears attuned to the tradition passed on to him from his mentor and he, in turn, passes on the spiritual sustenance of that tradition to those who are in need of its nourishment. This makes him a missionary disciple.