I often behave as if I were trying to validate my existence. Deep down, I know that something is wrong. The world is broken, and so am I. How can I be fixed? My attempts at self-justification projects did not alleviate my anxieties. But God surprised me by grace when I realized He had provided the solution to my problem in His two words: the law that condemns me for my sin and the gospel that justifies me through Christ's righteousness. When I am reminded of those two words, law and gospel, I realize that I am the problem, and the solution lies outside of me, in Jesus Christ. This good news seems too good to be true! This book provides a theological and historical exposition of God's righteous law and sublime gospel for sinners and saints dealing with their sins and being set free by the Word of Christ.