Augustine on the Sinlessness of Mary

"We must except the holy Virgin Mary, concerning whom I wish to raise no question when it touches the subject of sins, out of honour to the Lord; for from Him we know what abundance of grace for overcoming sin in every particular was conferred upon her who had the merit to conceive and bear Him who undoubtedly had no sin" (De nat. et grat. 36.42)

image from the 'Public domain' via wikimedia commons. Augustinus in betrachtendem Gebet, by Botticelli