Jesus the Son is the One who perfectly reveals God
As the Divine Son Christ fully comprehends the nature of God and is therefore capable of perfectly revealing God to man:
"At that time Jesus, full of joy through the Holy Spirit, said, ‘I praise you, Father, Lord of heaven and earth, because you have hidden these things from the wise and learned, and revealed them to little children. Yes, Father, for this was your good pleasure. All things have been committed to me by my Father. No one knows who the Son is except the Father, and no one knows who the Father is except the Son and those to whom the Son chooses to reveal him.’" Luke 10:21-22
The Lord Jesus claims an intimate, reciprocal knowledge of God the Father which presupposes both his incomprehensibility and his omniscience. After all, a finite creature is not able to know God in the same way that s/he is known by God; nor can a temporal being make the assertion s/he can only be known by God since this implies that the person making this claim is incomprehensible, and thereby requires an infinite mind or omniscient entity to fully know and understand such an individual. Yet this is precisely what Jesus says about his own Person and knowledge of the incomprehensible God.
It should therefore not surprise us that it is precisely in this context that Jesus claims to be the One who chooses to reveal the Father to whomever he is pleased. Seeing that the Lord Jesus has perfect and intimate knowledge of God he alone can adequately and completely reveal God’s essence/character/nature to mankind. As Christ says in the Gospel of John:
"No one can come to me unless the Father who sent me draws him, and I will raise him up at the last day. It is written in the Prophets: ‘They will all be taught by God.’ Everyone who listens to the Father and learns from him comes to me. No one has seen the Father except the one who is from God; only he has seen the Father." John 6:44-46
The reason why the Father brings everyone to learn from the Son is because he alone has beheld or comprehended God and therefore fully qualified to make the Father known.
To put this in simpler terms, God has clearly and fully made himself known in and through the Person of his beloved Son since the Son has complete knowledge and comprehension of the nature and Person of the Father.