How do we know that Scripture is sufficient for salvation?

In the narrative of the rich man and Lazarus, Abraham emphasizes that the rich man's brothers have Moses and the prophets, implying that God's Word is sufficient to guide them to salvation. The law given to Moses reveals our sinfulness and drives us to Christ for salvation. The prophets declare the necessity of faith in the promised Messiah. Therefore, the sufficiency of Scripture lies in its ability to convict sinners of their need for a Savior and to point them to Jesus Christ, who fulfills all the Law and Prophets.