Give an example of unmarried Witnesses who have used their circumstances to further Kingdom interests.
(‏ ٢ كو ١١ :‏ ​ ٢٣ -‏ ٢٧ ،‏ ٣٢ ،‏ ٣٣‏ )‏ لكِنَّ ٱلْفَرَحَ ٱلنَّاتِجَ عَنْ تَلْمَذَةِ كَثِيرِينَ أَنْسَاهُ كُلَّ ٱلْعَنَاءِ .‏