It is evident that they did not yet know of His miraculous birth: for they call Him the Son of Joseph. Nor are they blamed for this. Our Lord does not reply, I am not the Son of Joseph: for the miracle of His birth would have overpowered them. And if the birth according to the flesh were above their belief, how much more that higher and ineffable birth.
Reproduced in full. Translation: Oxford 1841 (Newman), public domain (Public domain).
Also cites: Hom. xlvi. 1