How do we know the curse of the law is true?

The curse of the law is substantiated by observable symptoms in humanity, such as pain, suffering, and spiritual deadness. The Bible states that the 'wages of sin is death' (Romans 6:23), showing that the transgression of God's command results in both physical and spiritual decay. This aligns with the witness of creation, which groans under the weight of sin, as highlighted in Romans 8. This mutual experience of suffering and death across humanity serves as a clear sign of our cursed condition and the necessity for divine redemption.