Sin Against God is Different
Eli warns his sons that while disputes between people can be settled by a judge, sinning directly against God is far more severe. Commentators explain this is because their sin was against the very system of worship and sacrifice God had established. Such offenses against God's holiness and His prescribed remedy for sin place a person in a uniquely dangerous position, for who can mediate on their behalf? As one scholar notes, only Jesus Christ can truly fill that role.