Is needed when there is a difference between two parties.
Now a mediator is not a mediator of one, but God is one. (Galatians 3:20)
Is a middle-man, a reconciler.
God sent forth His Son, made of a woman, made under the law, To redeem them that were under the law. (Galatians 4:4,5)
Is often appointed when an agreement or contract is broken.
They have transgressed the laws, changed the ordinance, broken the everlasting covenant. (Isaiah 24:5)
Must be willing to undertake the task.
I came down from heaven, not to do Mine own will, but the will of Him that sent Me. (John 6:38)
Must be approved for the job.
Jesus of Nazareth, a man approved of God among you by miracles and wonders and signs, which God did by Him in the midst of you. (Acts 2:22)
Is made the sole judge in the matters set before him.
The Father judgeth no man, but hath committed all judgment unto the Son … And hath given Him authority to execute judgment also, because He is the Son of man. (John 5:22-27)
Must be someone who loves peace and longs after it.
Unto us a Child is born, unto us a Son is given … His name shall be called … The Prince of Peace. (Isaiah 9:6)
In Christ Jesus ye who sometimes were far off are made nigh by the blood of Christ. For He is our peace. (Ephesians 2:13,14)
Must put personal ambition aside and seek the best for others.
Christ Jesus: Who, being in the form of God … made Himself of no reputation, and took upon Him the form of a servant, and … humbled Himself, and became obedient unto death, even the death of the cross. (Philippians 2:5-8)
Must be very wise.
Christ Jesus, who of God is made unto us wisdom, and righteousness, and sanctification, and redemption. (1 Corinthians 1:30)
Must be righteous.
If any man sin, we have an Advocate with the Father, Jesus Christ the righteous. (1 John 2:1)
Must be faithful.
Christ Jesus; Who was faithful to Him that appointed Him. (Hebrews 3:1,2)
Must endure hardship and rejection in bringing the parties together.
He is despised and rejected of men; a Man of sorrows, and acquainted with grief: and we hid as it were our faces from Him; He was despised, and we esteemed Him not. Surely He hath borne our griefs, and carried our sorrows: yet we did esteem Him stricken, smitten of God, and afflicted. But He was wounded for our transgressions, He was bruised for our iniquities: the chastisement of our peace was upon Him; and with His stripes we are healed. (Isaiah 53:3-5)
Usually has a set amount of time in which to complete the mediation.
He hath appointed a day, in the which he will judge the world in righteousness by that man whom he hath ordained; whereof he hath given assurance unto all men, in that he hath raised him from the dead. (Acts 17:31)
If ultimately rejected (after long patience), will leave the offender subject to the severity of the law.
He that believeth not the Son shall not see life; but the wrath of God abideth on him. (John 3:36)
—Adapted from “Christ A Mediator” by Learn The Bible.