What does it mean that sin is in the blood?

The concept that sin is in the blood reflects the biblical teaching about original sin and the fallen nature of humanity. Romans 5:12 explains that as sin entered the world through one man, Adam, death spread to all men because all sinned. This inherited condition indicates that every human is born with a propensity to sin, affirming that our nature requires divine intervention for redemption. The recognition of this reality is crucial for understanding the necessity of Christ’s sacrifice, as only He, being sinless, can provide true atonement for our blood-soiled condition.