It may be possible to help them realize that failure to preach the good news has resulted in the loss of joy.
لِنَفْرِضْ مَثَلًا أَنَّكَ شَيْخٌ يَزُورُ زَوْجَينِ خَمَلَا نَتِيجَةَ « هُمُومِ ٱلْحَيَاةِ » .‏