Paul continues his excursus on the MYSTERY that he had been tasked to preach. He aptly summarizes the MYSTERY in three different UNION descriptions in verse 6. This MYSTERY in a nutshell is God’s grand plan to accomplish salvation (in all aspects) IN Christ, through a BRAND-NEW entity known as the church! Additionally, although Paul views himself as somewhat insignificant, he recognizes his valuable role in declaring this valuable truth.