The Scofield Bible Commentary, by Cyrus Ingerson Scofield, [1917], at sacred-texts.com
the righteous man from the east
The reference here seems to be to Cyrus, whose victories and rapid growth in power are here ascribed to the providence of God. (Isa 41:5-7) describe the effect upon the nations of the rise of the Persian power. They heartened each other, and made (Isa 41:7) new idols. At (Isa 41:8), the prophet addresses Israel. Since it was their God who raised up Cyrus, they should expect good, not evil, from him (Isa 41:8-20). (Isa 41:21-24) form a contemptuous challenge to the idols in whom the nations are trusting.
servant
Three servants of Jehovah are mentioned in Isaiah:
(1) David (Isa 37:35).
(2) Israel the nation (Isa 41:8-16); (Isa 43:1-10); (Isa 44:1-8); (Isa 44:21); (Isa 45:4); (Isa 48:20).
(3) Messiah (Isa 42:1-12); Isaiah 49, entire chapter, but note especially (Isa 49:5-7); where the Servant Christ restores the servant nation; (Isa 50:4-6); (Isa 52:13-15); (Isa 52:53); (Isa 52:1-12). Israel the nation was a faithless servant, but restored and converted will yet thresh mountains. Against the Servant Christ no charge of unfaithfulness or failure is brought.
(See Scofield) - (Isa 42:1).
redeemed
Hebrew, "goel," Redemption (Kinsman type).
(See Scofield) - (Isa 59:20).