Isaiah 50:10 - Matthew Poole's English Annotations on the Holy Bible

Who is among you that feareth the Lord? he now turneth his speech from the unbelieving and rebellious Jews to those of them who were or should be pious. Of his servant; of the same person of whom he hath hitherto spoken; of Christ, who is called God's servant, Isaiah 52:13, Isaiah 53:11, partly by way of eminency, and partly to intimate that although he was God, yet he should take upon himself the form of a servant, as is said, Philippians 2:7. He hereby signifies that the grace of God, and the comfort here following, belongeth to none but to those that hear and believe this great Prophet of the church; which also was declared by Moses, Deuteronomy 18:15, compared with Acts 3:22,23. In darkness; not in sin, which is oft called darkness; as walking in darkness is put for living in wickedness, 1 John 1:6; but in misery, which also frequently cometh under the name of darkness: that liveth in a most disconsolate and calamitous condition, together with great despondency or dejection of spirit. No light; no comfort nor hope left. Let him trust in the name of the Lord, and stay upon his God; let him fix his faith and hope in the name, i.e. in the most excellent and amiable nature, and infinite perfections, and especially in the free grace, and mercy, and faithfulness, of the Lord, declared in his word; and in his propriety or interest in God, who by the mediation of this Servant is reconciled to him, and made his God.