Mediator

One who intervenes between two persons who are at variance, with a view to reconcile them. This word is not found in the Old Testament; but the idea it expresses is found in Job 9:33, in the word "daysman" (q.v.), marg., "umpire." This word is used in the New Testament to denote simply an internuncius, an ambassador, one who acts as a medium of communication between two contracting parties. In this sense Moses is called a mediator in Gal. 3:19. Christ is the one and only mediator between God and man (1 Tim. 2:5; Heb. 8:6; 9:15; 12:24). He makes reconciliation between God and man by his all-perfect atoning sacrifice. Such a mediator must be at once divine and human, divine, that his obedience and his sufferings might possess infinite worth, and that he might possess infinite wisdom and knowlege and power to direct all things in the kingdoms of providence and grace which are committed to his hands (Matt. 28:18; John 5:22, 25, 26, 27); and human, that in his work he might represent man, and be capable of rendering obedience to the law and satisfying the claims of justice (Heb. 2:17, 18; 4:15, 16), and that in his glorified humanity he might be the head of a glorified Church (Rom. 8:29). This office involves the three functions of prophet, priest, and king, all of which are discharged by Christ both in his estate of humiliation and exaltation. These functions are so inherent in the one office that the quality appertaining to each gives character to every mediatorial act. They are never separated in the exercise of the office of mediator.

one who stands in a middle office or capacity between two differing parties, and has a power of transacting every thing between them, and of reconciling them to each other. Hence a mediator between God and man is one whose office properly is to mediate and transact affairs between them relating to the favour of almighty God, and the duty and happiness of man. No sooner had Adam transgressed the law of God in paradise, and become a sinful creature, than the Almighty was pleased in mercy to appoint a Mediator or Redeemer, who, in due time should be born into the world, to make an atonement both for his transgression, and for all the sins of men.