The Trinity is a foreshadowing of our eternal life--a oneness
with the Father, Jesus and the Holy Spirit. We will share the
life of the Godhead; as He knows so shall we know.
The Saints already in union, at-one-ness with God share his
life and his knowledge.
Paul put it succinctly.
1 Corinthians 13:12
At present we see indistinctly, as in a mirror, but then
face to face. At present I know partially;
then I shall
, as I am fully known.