Ephesians 3:3

3 that is, the mystery made known to me by revelation, as I have already written briefly.

Read Ephesians 3:3 Using Other Translations

How that by revelation he made known unto me the mystery; (as I wrote afore in few words,
how the mystery was made known to me by revelation, as I have written briefly.
As I briefly wrote earlier, God himself revealed his mysterious plan to me.