How do we know John Newton's conversion story is true?

The truth of John Newton's conversion story is supported by his own writings and historical records. Newton himself chronicled his life experiences in memoirs and poetry, detailing his descent into sin and his dramatic encounter with God's grace during a life-threatening storm at sea. Historical accounts confirm his later influence as a preacher and hymn writer, particularly his iconic hymn 'Amazing Grace.' His life serves as a testimony to the power of God's grace to transform even the most notorious of sinners into vessels of His glory, as expressed in 1 Timothy 1:15, where Paul states that Jesus came to save sinners, of whom he was the worst, highlighting the redeeming power of grace.