Attend, O Arius. He saith not, He was created before me, but He was before me. Let the false sect of Paul of Samosata attend. They will see that He did not derive His original existence from Mary; for if He derived the beginning of His being from the Virgin, how could He have been before His precursor? it being evident that the precursor preceded Christ by six months, according to the human birth.
Reproduced in full. Translation: Oxford 1841 (Newman), public domain (Public domain).
Also cites: in loc.