Being the Covenant.

From yesterday's Advent reading, Isaiah 42.1-7:

Here is my servant, whom I uphold,
     my chosen, in whom my soul delights;
I have put my spirit upon him;
     he will bring forth justice to the nations.
He will not cry or lift up his voice,
     or make it heard in the street;
a bruised reed he will not break,
     and a dimly burning wick he will not quench;
     he will faithfully bring forth justice.
He will not grow faint or be crushed
     until he has established justice in the earth;
     and the coastlands wait for his teaching.

Thus says God, the LORD,
     who created the heavens and stretched them out,
     who spread out the earth and what comes from it,
who gives breath to the people upon it
     and spirit to those who walk in it;
I am the LORD, I have called you in righteousness,
     I have taken you by the hand and kept you;
I have given you as a covenant to the people,
     a light to the nations,
     to open the eyes that are blind,
to bring out the prisoners from the dungeon,
     from the prison those who sit in darkness.

I keep being brought back to the phrase "I have given you as a covenant to the people, a light to the nations." I've been pondering how Jesus embodied this kind of calling. How was he a gift from God, a covenant to the people? I've also been thinking about my own life. How am I being "a covenant to the people?"