"No soldier serves when he is involved in the everyday business of this life" or "When soldiers are serving, they do not get distracted by the ordinary things that people do." Christ's servants should not allow everyday life to keep them from working for Christ.
Paul is implicitly speaking of Christ's servants as if they were athletes. (See: [[rc://en/ta/man/translate/figs-explicit]] and [[rc://en/ta/man/translate/figs-metaphor]])
This can be stated in active form. AT: "they will crown him as winner only if he competes by the rules" (See: [[rc://en/ta/man/translate/figs-activepassive]])