A Study on the First Epistle to the Corinthians by Jesse C Jones
Paul addresses his letter to those at Corinth that are sanctified in Christ Jesus and called to be saints, along with all the others who call upon the name of Jesus Christ our Lord. Paul draws a line here between those in the church at Corinth that are (or are being) sanctified and called to be saints, from those that believe in Jesus Christ our Lord, but have not yet entered into sanctification. He seems to emphasize the fact that all the above, both sanctified and not yet sanctified, are followers of the same Lord. He goes on to beseech them to speak in unity, and be perfectly joined together, of a common mind and purpose, with no divisions among them.