en_tn_condensed/col/02/02.md

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so that their hearts

"so that their hearts and yours"

brought together

This means brought together in a close relationship.

all the riches of full assurance of understanding

Paul speaks of a person who is completely sure that the good news is true as though that person were rich in physical things.

the mystery of God

This is knowledge that can be revealed only by God.

that is, Christ

Jesus Christ is the mystery revealed by God.