Find a single WRITER of those originals that make the point that Mary WAS immaculately conceived.
p.s., I don’t believe in luck.
"And, moreover, the ark made of imperishable wood was the Saviour Himself. For by this was signified the imperishable and incorruptible tabernacle of (the Lord) Himself, which gendered no corruption of sin. For the sinner, indeed, makes this confession: My wounds stank, and were corrupt, because of my foolishness. But the Lord was without sin, made of imperishable wood, as regards His humanity; that is, of the virgin and the Holy Ghost inwardly, and outwardly of the word of God, like an ark overlaid with purest gold." Hippolytus, Fragments from the Scriptural Commentaries of Hippolytus, [A.D. 235]"
"This Virgin Mother of the Only-begotten of God is called Mary, worthy of God, immaculate of the immaculate, one of the one" (Origen, Homily 1 [A.D. 244]).
"Come, then, and search out your sheep, not through your servants or hired men, but do it yourself. Lift me up bodily and in the flesh, which is fallen in Adam. Lift me up not from Sarah but from Mary, a Virgin not only undefiled but a Virgin whom grace had made inviolate, free of every stain of sin (St. Ambrose, Commentary on Psalm 118:22-30 [A.D. 387]).
"Now with the exception of the holy Virgin Mary in regard to whom, out of respect for the Lord, I do not propose to have a single question raised on the subject of sin -- after all, how do we know what greater degree of grace for a complete victory over sin was conferred on her who merited to conceive and bring forth Him who all admit was without sin -- to repeat then: with the exception of this Virgin, if we could bring together into one place all those holy men and women, while they lived here, and ask them whether they were without sin, what are we to suppose that they would have replied?" (St. Augustine, Nature and Grace 36:42 [A.D. 415]).
There are others as well.