Believers approve of and rejoice in this righteousness [of Christ] because it brings great peace and assurance to their souls. They remember what fears they had before. But now 'being justified by faith, they have peace with God' (Rom 5.1). All is quiet and still. Not only is the storm over, but they are safely anchored in the harbour. They have abiding peace with God. So we have that wonderful description of Christ given to us in Isaiah (Isa 32.2). The soul, through Christ, is at perfect peace with God (Isa 26.3; Psa. 4.6-8). So the souls of believers glorify the Lord Christ because they can come boldly to God with confidence, peace, joy and assurance. They can call him Father. They can strengthen themselves in his love. They can walk in peace and live without fear. Once they ran from him for fear. Now they can approach him with love, joy and peace.
John Owen, Communion with God (Banner of Truth), p.142