How does union with Christ affect our struggle with sin?

Union with Christ is a foundational concept in Reformed theology, emphasizing that believers are spiritually united with Christ in His death and resurrection. Romans 6 teaches that because believers are baptized into His death, they are dead to sin's penalty and its power. This theological reality provides both hope and motivation, as they no longer serve sin but yield themselves to God as instruments of righteousness. This transformation does not eliminate the struggle with sin but instills within believers the power to resist temptation and cling to holiness, knowing that Christ’s victory over sin ensures their ultimate triumph.