2 Corinthians 7:5

When he had arrived in Macedonia Paul could not find Titus. Consequently he continued to experience affliction from conflicts with unbelievers, and from his concern for Titus and the Corinthians’ response to his "severe letter" (cf. 2 Corinthians 2:12-13). His reference to "flesh" emphasizes "the weakness of human nature which is so much influenced by external circumstances and internal moods." [Note: Bruce, p. 217.] Paul evidently used flesh (Gr. sarx) here, as he used spirit (Gr. pneuma) in 2 Corinthians 2:13, to refer to his whole person.