Prophets know God because God reveals himself to them; teachers transmit what they have received. Jesus speaks in a categorically stronger way: no one knows the Father except the Son, and no one knows the Son except the Father.
The saying also follows Jesus' thanksgiving to the Father as Lord of heaven and earth, placing the claim within an explicitly theological context.
The Old Testament prizes the knowledge of God and portrays God as the one who reveals himself and his purposes. Yet no prophet is described as standing in an exclusive reciprocal relation of knowledge with God comparable to the Father-Son relationship stated here.
Wisdom traditions also associate divine Wisdom with privileged knowledge and revelation, providing a conceptual background for the extraordinary revelatory role Jesus claims.
Jesus first declares that 'all things' have been handed over to him by his Father. He then describes mutual knowledge: only the Father truly knows the Son, and only the Son truly knows the Father.
The saying concludes with the Son's sovereign role in revelation: the Father is known by those to whom the Son chooses to reveal him. Jesus is therefore not merely one revealer among many; access to knowledge of the Father is centered in him.
The verse does not collapse Father and Son into one person. Their distinction is explicit. Its Christological force lies instead in the unparalleled relationship and authority Jesus claims.
Within a conservative Trinitarian reading, the mutual knowledge and comprehensive authority fit naturally with Jesus' divine sonship. The saying also demonstrates that exceptionally high Christology is not confined to John's Gospel.