Verse 10 Yet not altogether, &c. The sense is, that he did not mean to cut them off from all communication with vicious men, who were of this world,--that is, who were not of the church,--and whose vices, of course, did not compromise the purity and character of the church; but only, as is explained in the 1 Corinthians 5:11, from every such one, who is called a brother; that is, who, being joined with them in name, would bring upon them the reproach of his sins. Thus it seems that special precautions are necessary to avoid countenancing the sins of those, who make pretensions to piety.