Why could a Jew not comprehend that Christ dwells in Gentiles?
A Jew could never comprehend it because it was the secret—that Christ is in a Gentile—and this truth was not understood or acknowledged; the book declares Christ is dwelling in Gentiles. Even when the mystery is presented, few understand it, and if they do, they will not recognize or acknowledge it.
Les explains that the secret is that Christ is in a Gentile, and this is something a Jew could never comprehend. He stresses that Christ is dwelling in Gentiles and that we should believe it because that is what the book says. He then moves to chapter 2, verse 2, where hearts are comforted and knit together in love unto all riches of the full assurance of understanding and the acknowledgment of the mystery. Les laments that few people understand it, and if they do, they will not recognize or acknowledge it. In Colossians chapter 4, verse 3, the request is to pray that the secret of Christ might be spoken.