Berean Study Bible
This mystery is profound, but I am speaking about Christ and the church.

King James Bible
This is a great mystery: but I speak concerning Christ and the church.

American Standard Version
This mystery is great: but I speak in regard of Christ and of the church.

Darby Bible Translation
This mystery is great, but I speak as to Christ, and as to the assembly.

Douay-Rheims Bible
This is a great sacrament; but I speak in Christ and in the church.

English Revised Version
This mystery is great: but I speak in regard of Christ and of the church.

Young's Literal Translation
this secret is great, and I speak in regard to Christ and to the assembly;