Colossians 2:2-4- 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, in whom are hidden all the treasures of wisdom and knowledge.  I say this in order that no one may delude you with plausible arguments.

Colossians 4:3- At the same time, pray also for us, that God may open to us a door for the word, to declare the mystery of Christ