Isaiah 49:4-5

4But I said, I have labored in vain, I have spent my strength for nought and vanity; yet surely the justice due to me is with Jehovah, and my recompense with my God.

5And now saith Jehovah that formed me from the womb to be his servant, to bring Jacob again to him, and that Israel be gathered unto him (for I am honorable in the eyes of Jehovah, and my God is become my strength);