When He says, “Neither does any know the Father but the Son,” He does not mean that all men are altogether ignorant of Him; but that none knows Him with that knowledge wherewith He knows Him; which may also be said of the Son. For it is not said of some unknown God [margin note: i.e. who was not the Creator] as Marcion declares.
Reproduced in full. Translation: Oxford 1841 (Newman), public domain (Public domain).