Now to him that is of power - more simply, as in Jud 1:24, “to Him that is able.”
to stablish - confirm, or uphold
you, according to my gospel, and the preaching of Jesus Christ - that is, in conformity with the truths of that Gospel which I preach, and not I only, but all to whom has been committed “the preaching of Jesus Christ.”
according to the revelation of the mystery - (See on Rom 11:25).
which was kept secret since the world began - literally, “which hath been kept in silence during eternal ages.”