Pardoning mercy comes by Christ alone. This pardoning mercy is revealed in the gospel, and in this pardoning mercy God will be glorified for ever (Eph 1.6). Pardoning mercy is not a vague general mercy which overlooks sin. This would be dishonouring to God. Pardoning mercy is God's free, gracious acceptance of a sinner because satsifaction was made to his justice consistent with his glory. It is a mercy of inconceivable wonder, for God came down from the heights of glory to bring forgiveness to sinners, whilst at the same time exacting justice and severity on sin.
John Owen Communion with God (Banner of Truth 1991), p.80