Tertullian Against Praxeas In a later passage He declares that He is known by the Father, and the Father by Him;[295] Alexander Epistles on the Arian Heresy Now concerning their blasphemous assertion who say that the Son does not perfectly know the Father, we need not wonder: for having once purposed in their mind to wage war against Christ, they impugn also these words of His, "As the Father knoweth Me, even so know I the Father."[59]