https://www.mljtrust.org/sermons-online/romans-5-1-2/certainty-of-salvation/

What is “peace with God” and how does one attain it? In the sermon titled “Certainty of Salvation,” Dr. Martyn Lloyd-Jones discusses this as he preaches on Romans 5:1–2. Paul has just finished explaining that righteousness by faith was not only imputed for Abraham, but also for all Christians. The apostle shows the absolute finality and fullness of salvation which comes as a result of faith. The greatest proof of final salvation and assurance is union with Christ. Dr. Lloyd-Jones explains three things done by justification by faith: it puts the Christian at peace with God, sets them firmly in a place of all blessings, and enables them to exalt the prospect of future glorification. Before one is even able to obtain blessings or think about future glorification, they need to have access to the Lord. Salvation and all its blessings are only attained through the Lord Jesus Christ. Dr. Lloyd-Jones defines and explains what peace with God is and how Paul will continue on with this theme in the coming verses.