Job expressed the universal need of mankind when he cried:

“For [God] is not a [mere] man, as I am, that I should answer Him, that we should come together in court. There is no umpire (days-man, one who argues) between us, who might lay his hand upon us both, [would that there were!]” (Job 9:32-33 AMP)

Job needed an advocate to stand between him and God to plead his case. He knew that no ordinary man could do this as they would need a days-man of their own. All are guilty and condemned before a holy and righteous Judge.

God also recognised this dilemma and acted on our behalf:

“He saw that there was no man,And wondered that there was no intercessor;Therefore His own arm brought salvation for Him;And His own righteousness, it sustained Him.”(Isaiah 59:16 NKJV)

He sent Jesus.