Some choose not to make full use of those opportunities so that they can pursue spiritual goals. What motivates Christians like Robert to expend themselves in the preaching work?
(‏ ١ كو ٧ :‏ ​ ٢٩ -‏ ٣١‏ )‏ فَمَا ٱلَّذِي يَدْفَعُ مَسِيحِيِّينَ أَمْثَالَ روبرت إِلَى بَذْلِ أَنْفُسِهِمْ فِي عَمَلِ ٱلْكِرَازَةِ ؟‏