In part, that involves learning Bible truth. What convinces one person that Jehovah’s Witnesses teach the truth may differ from what convinces another.
(‏ رو ١٢ :‏ ​ ١ ،‏ ٢‏ )‏ وَأَحَدُ ٱلْأُمُورِ ٱلَّتِي يَشْمُلُهَا ذلِكَ هُوَ تَعَلُّمُ حَقِّ ٱلْكِتَابِ ٱلْمُقَدَّسِ .‏