The High Priest has to do with our access to God; the Advocate, with our communion with the Father and His government of us as children. The Epistle to the Hebrews treats of the ground of access, and shows us to be perfected forever. The priestly intercession does not apply to sins in that respect. It brings mercy and grace to help in time of need here; but we are perfected forever before God. Yet communion is necessarily interrupted by the least sin or idle thought—yea, really had been practically, if not judicially, before the idle thought was there. Here the advocacy of John comes in, “If any one sin;” and the soul is restored. But there is never imputation of sin to the believer.