Andrew Bonar addresses a friend in spiritual despair, emphasizing the importance of prayer and the dangers of pride that can hinder one's acceptance of God's grace. He highlights that feelings of despair often stem from a refusal to acknowledge one's absolute need for Christ's forgiveness and the tendency to let Satan exploit our weaknesses. Bonar encourages the friend to submit to God's righteousness and to trust in the truth that we are children of God by faith, regardless of our feelings. He reminds her that true rest and healing come from accepting Christ's love and grace, urging her to open her heart to the 'Sun of Righteousness.'