وَالِاعْتِقَادَ الْجَازِمَ الَّذِي يَقْبَلُ الزَّوَالَ
And firm conviction that is capable of being displaced.
In ẓann, one possibility is preferred without excluding the other. In firm conviction, a person may feel completely persuaded; yet if the grounds remain non-decisive, contrary evidence can undo that conviction. The psychological strength of belief should not be confused with indefeasible certainty.
Someone might feel entirely sure after hearing a trusted witness and later discover powerful contrary testimony. The earlier sincerity and strength of the belief were not, by themselves, proof that its content was necessarily true. This same caution helps distinguish inspiration, solitary reporting, and juristic following from decisive knowledge.