Why should you be convinced that your diligent efforts to train others in Jehovah’s service will be successful?
ثُمَّ ٱسْتَفَادَ مِمَّا تَعَلَّمَهُ وَطَبَّقَهُ فِي خِدْمَتِهِ وَفِي مُسَاعَدَةِ ٱلْآخَرِينَ فِي ٱلْجَمَاعَةِ .‏ —‏ ٢ تي ٣ :‏ ١٠ -‏ ١٢‏ .‏