Matthew 12:18

Behold my servant, &c. The words are out of the prophet Isaias, Chap. xli. 1. And it is observed that the Jews, before the coming of Jesus, used to expound them of their Messias. (Witham) --- Our Lord Jesus Christ may be called the Servant of the Almighty, because, as himself assures us, he came down not to be served, but to serve; or, as St. Remigius says, not on account of his divinity, but on account of his humanity, which he received from the pure flesh and blood of the immaculate Virgin. (in St. Thomas Aquinas) There is some difference in the text of Isaias, whence this is taken. The apostles and evangelists did not confine themselves to cite the very words of the text, but only the sense. (Bible de Vence)