God: "I looked for someone to take a stand for me, and stand in the gap" (Ezekiel 22:30)
A man who confesses his sins in the presence of a brother knows that he is no longer alone with himself; he experiences the presence of God in the reality of the other person. As long as I am by myself in the confession of my sins, everything remains in the clear, but in the presence of a brother, the sin has to be brought into the light.