Of course there are other references by him for that supposition?
Yet if one were to accept this supposition, why wasn't this understanding, that is in conflict with Scripture, not included in his creed which lays out the catholic faith? After all he includes in his creed this: it is necessary to everlasting salvation that he also believe faithfully the incarnation of our Lord Jesus Christ.
I guess this should have been my answer to the Catholic FReeper who asked "How can you ever talk about the idea of the incarnation without bringing her into the matter." (sic) Apparently Athanasius found no need to include Mary's participation in the Incarnation other then recognizing it as a Virgin birth.
There is not writings that support Mary as sinful by Blessed Athanasius
Prayer by St. Athanasius
"It is becoming for you, O Mary, to be mindful of us, as you stand near him who bestowed upon you all graces, for you are the Mother of God and our Queen. Come to our aid for the sake of the King, the Lord God and Master who was born of you. For this reason you are called “full of grace.” Be mindful of us, most holy Virgin, and bestow on us gifts from the riches of your graces, O Virgin full of grace."