RobH_en_tn/col/01/27.md

the riches of the glory of this secret truth

Paul speaks of the value of this secret truth about God as if it were a treasure of material wealth. "riches" (See: rc://en/ta/man/translate/figs-metaphor)

Christ in you

Paul speaks of the believers as if they were actual containers in which Christ is present. This is one of his ways of expressing the union of the believers with Christ. (See: rc://en/ta/man/translate/figs-metaphor)

the hope of glory

"so you can confidently expect to share in God's glory"