Thus saith God the Lord; literally, thus saith the (One) God, Jehovah. The entire utterance, Isaiah 42:1-4, is the utterance of God; but, as that fact is gathered by inference, not asserted, the prophet suddenly stops, and makes a new beginning.
It must be made perfectly clear that the announcement of the "Servant of the Lord" and his mission are from the Almighty; and so we have the solemn announcement of the present verse. He that created the heavens, etc.
(comp. Isaiah 40:12, Isaiah 40:22). The earth, and that which cometh out of it; i.e. all that the earth produces—gold, and silver, and precious stones, and corn, and wine, and luscious fruits, and lovely flowers—all that sustains life, and all that makes life delightful—nay more, life itself—the breath and the spirit that make men living beings.