"The LORD YAHWEH has taught me
so I speak as HIS disciple
and I know how to sustain the weary.
Morning after morning HE wakes me up
to hear, to listen like a disciple.
The LORD YAHWEH has opened my ear.
I have not rebelled,
nor have I withdrawn.
I offered my back to those who strike me,
my cheeks to those who pulled my beard;
neither did I shield my face
from blows, spittle and disgrace.
I have not despaired,
for the LORD YAHWEH comes to my help.
So, like a flint I set my face,
knowing that I will not be disgraced."
- Isaiah 50:4-7
("Who is the prophet talking about, himself or another?" [Acts 8:34]. Actually the servant could be as in 49:1 the faithful minority, but it could also be, perhaps, the prophet himself, or who knows, a "Prophet" who is to come? The author refuses to choose between servant and servants.
Former prophets met with the same opposition. Moses had to endure rebellious people; Jeremiah had been persecuted and imprisoned [see Jeremiah 20:7 and 37]. On the basis of these examples, we see a profile and mission of the perfect servant of YAHWEH. This will be JESUS, but every one of HIS prophets can apply all these words to himself or herself.
Note the beginning of the poem. The Servant will be able to transmit the word and to encourage on behalf of GOD because he himself listens every morning and keeps his ears open. To sustain those who are tired, we must be taught by GOD: the true prophet is a person of prayer, open to the spirit of GOD. "No one but the spirit of GOD knows the secrets of GOD... and through HIM we understand what GOD in HIS goodness has given us" [1 Corinthians 2:11-12].