1 Timothy 2:5 For there is one God, and there is one mediator between God and men, the man Christ Jesus,
Mediation is a process wherein the parties meet with a mutually selected impartial and neutral person who assists them in the negotiation of their differences. Source jamsadr.com
That is a worldly definition of mediation but it is not spiritual. Jesus is not neutral nor is He impartial. He gave His life for us, He is very invested.
We use language, words and definitions to make our position known. God uses His Spirit. What we need in this understanding is someone who speaks in both terms. The one defining method of the mediator that meets both a worldly definition and a spiritual definition is this one issue, a mutually selected mediator.
If someone does not have Jesus to speak for them, they do not have anyone that can explain our side of our experiences. God would then have no way to interpret our lives other than the acts we performed. That person would not have an opportunity to listen to God and understand His way of looking at things, all things.
Now we, who serve Christ, use all the languages, words and definitions is a quest to help those in need of a mediator, to select the right mediator. We are not mediators, we are clients who are making recommendations to them about His abilities to negotiate our position to our God.
What qualifies us as clients to advise others of their needs? Experience, we were once where they are in this life. Our experience is our witness, our witness is our truth but unique to us but similar to others. Our words may not ring true to everyone. The best part of being in a body of believers is the vast source of experiences available to draw from. In order to draw on those resources we have to make ourselves available to a diverse number of experiences, not hanging out with only those that share our past.
If my past is not relatable, perhaps yours will. We are unique and yet all the same, in need of a mediator who understands us.
Matthew 7:23 And then will I declare to them, ‘I never knew you; depart from me, you workers of lawlessness.’
His words tell me that the people He is talking about never opened their heart and let Him in to get to know them intimately. That is my understanding, what is yours?