How do we know that Mary was a sinner saved by grace?

Mary's song, known as the Magnificat, reveals her deep understanding of God's grace and her own lowly state. In Luke 1:47, she states, 'My spirit hath rejoiced in God my Savior,' which clearly shows that she recognizes her own need for salvation. If Mary were without sin, she would not require a Savior. Additionally, the wording of her confession reflects a humble acknowledgment of God's grace towards her, a common trait shared by all true believers who are saved by grace through faith.