The Helper (The Holy Spirit) is known as the “Spirit of Truth whom the world cannot receive, because it does not behold Him or know Him” (John 14:17). There is no mystery as to why we are in such exclusive union and understanding: The Helper has brought us the absolute and concrete truth about Himself and ourselves.
There is no doubt because truth has no doubt. “But you know Him because he abides in you and will be in (inside) you” (14:17). Jesus came from the Father as a gift “full of grace and truth” and His fullness we have received (our response to the gift) “grace upon grace” (1:16-17). The pure concept of contrast is then given: “For the law was given by Moses; grace and truth were realized through Jesus Christ” (John 1:17). The law is holy but Jesus is the Holy One.
Only the Helper can cause us to make some kind of distinction between being happy and satisfied moral and ethical people in a satisfied state and seeing ‘the truth’ of a higher state in kingdom values and virtues. If we do not know such distinction then we have not tasted the inner truth of the fine wine but only admired the bottle in the rack. Truth is consumed or it remains a static principle of only knowing but not participating. The Helper causes us to desire participation in our hearts and minds.
“For he whom God has sent utters the words of God, for he gives the Spirit without measure.” Jesus