7:1-9 The apostle tells the Corinthians that it was good, in that juncture of time, for Christians to keep themselves single. Yet he says that marriage, and the comforts of that state, are settled by Divine wisdom. Though none may break the law of God, yet that perfect rule leaves men at liberty to serve him in the way most suited to their powers and circumstances, of which others often are very unfit judges. All must determine for themselves, seeking counsel from God how they ought to act.
5. Defraud … not—namely, of the conjugal duty "due" (1Co 7:3; compare the Septuagint, Ex 21:10).
except it be—"unless perchance" [Alford].
give yourselves to—literally, "be at leisure for"; be free from interruptions for; namely, on some special "season," as the Greek for "time" means (compare Ex 19:15; Joe 2:16; Zec 7:3).
fasting and prayer—The oldest manuscripts omit "fasting and"; an interpolation, evidently, of ascetics.
come together—The oldest manuscripts read, "be together," namely, in the regular state of the married.
Satan—who often thrusts in his temptations to unholy thoughts amidst the holiest exercises.
for your incontinency—because of your inability to "contain" (1Co 7:9) your natural propensities, which Satan would take advantage of.