Jamieson, Fausset and Brown on 2 Corinthians 7:5

5. Greek, "For also" (for "even"). This verse is thus connected with 2Co 2:12, 13, "When I came to Troas, I had no rest in my spirit"; so "also" now, when I came to Macedonia, my "flesh" had no rest (he, by the term "flesh," excepts his spiritual consolations) from "fightings" with adversaries "without" (1Co 5:12), and from fears for the Corinthian believers "within" the Church, owing to "false brethren" (2Co 11:26). Compare 2Co 4:8; De 32:25, to which he seems to allude.