John 14:7

“If you had fully known me you would have known my Father as well. And from now on you do know him and have seen him.”

Jesus now confirms His uniqueness. The question is, have they fully known Him? Let them now recognise Who He really is. He is the One Who has fully revealed the Father in such a way that to have known Him is to have fully known the Father. That is why John, in amazed wonder when enlightenment had fully come, could say, ‘We beheld his glory, the glory as of the only Son of the Father' (John 1:14), and this is what Jesus is saying here. He is saying that as ‘the only Son of the Father', that is as the only One of the same substance and essence as the Father, He is the only One Who reveals what God essentially is. In the words of Hebrews ‘He is the outshining of His glory and the exact representation of His substance' (Hebrews 1:3). In consequence they not only know the Father through Him, but have actually seen the Father in Him in such a way as to describe it as having actually seen the Father. Through knowing Him they have known the Father in His essential Being.