How do we know the doctrine of Christ's righteousness is true?

Christ’s righteousness is a profound theological truth rooted in His nature as the perfect, sinless Savior. In Luke 3:23, we see that Jesus began His public ministry at around 30 years of age, the age when Jewish society recognized a man as capable of leadership. This significance underscores that He lived an adult life, resisting all temptations and fulfilling the entirety of God's law, not for Himself but for His people. Romans 5:19 elaborates that, 'For as by one man’s disobedience many were made sinners, so by the obedience of one shall many be made righteous.' Christ's obedience and righteousness are imputed to believers, grounding our justification not in our works but in His.