I can’t say it any better than God to Isaiah:
Isaiah 49 The Message (MSG)
A Light for the Nations
49 1-3 Listen, far-flung islands,
pay attention, faraway people:
God put me to work from the day I was born.
The moment I entered the world he named me.
He gave me speech that would cut and penetrate.
He kept his hand on me to protect me.
He made me his straight arrow
and hid me in his quiver.
He said to me, “You’re my dear servant,
Israel, through whom I’ll shine.”
4 But I said, “I’ve worked for nothing.
I’ve nothing to show for a life of hard work.
Nevertheless, I’ll let God have the last word.
I’ll let him pronounce his verdict.”
5-6 “And now,” God says,
this God who took me in hand
from the moment of birth to be his servant,
To bring Jacob back home to him,
to set a reunion for Israel—
What an honor for me in God’s eyes!
That God should be my strength!
He says, “But that’s not a big enough job for my servant—
just to recover the tribes of Jacob,
merely to round up the strays of Israel.
I’m setting you up as a light for the nations
so that my salvation becomes global!”