are called’, and from that point to the end of the Epistle he continues making this great and grand appeal. But we observe that even after having started on that practical theme Paul still cannot leave the doctrine, for in verses 1 to 16 of chapter 4 we have one of the most wonderful expositions of the nature of the Christian Church that can be found anywhere in the Scripture. Not until verse 17 does he again come back to this matter of the practical application: ‘This I say therefore, and testify