How do we know that the doctrine of original sin is true?

The doctrine of original sin is rooted in Scripture, particularly evidenced in Psalm 51:5, where David expresses, 'Behold, I was shapen in iniquity; and in sin did my mother conceive me.' This highlights that every person inherits a sinful nature at birth. The total depravity of humanity is a central theme in Reformed theology, underscoring that all individuals are estranged from God due to Adam's initial disobedience. Other passages, such as Psalm 58:3, reiterate that from the womb, people come forth speaking lies, serving to confirm the universal reality of sinfulness and its consequences. Thus, our inherent sinfulness affirms the need for grace and redemption found in Jesus Christ.