That their hearts may be encouraged, being knit together in love, to reach all the riches of full assurance of understanding and the knowledge of God's mystery, which is Christ. Colossians 2:2
Colossians 1:24 - 2:5
ESV - 24 Now I rejoice in my sufferings for your sake, and in my flesh I am filling up what is lacking in Christ's afflictions for the sake of his body, that is, the church. 25 Of which I became a minister according to the stewardship from God that was given to me for you, to make the word of God fully known.
For follow-up discussion and general commentary on the topic. Comments are sorted chronologically.