They do so by helping others to benefit from the spiritual treasures of wisdom and knowledge of God. Opposers have tried to put a stop to the Kingdom - preaching work but have failed.
كَمَا أَنَّ ثَبَاتَ خُدَّامِ ٱللهِ فِي مَسْلَكِ ٱلْبِرِّ يَضْمَنُ لَهُمْ أَنْ يَبْقَوْا ‹ قَائِمِينَ إِلَى ٱلْأَبَدِ › ،‏ أَيْ أَحْيَاءً مَدَى ٱلدَّهْرِ .‏