إِنَّ الْفَرَجَ لَقَرِيبٌ
Relief is surely near.
A listener facing difficulty may regard relief as very unlikely. “إِنَّ” and the emphatic lām counter that sense of improbability. Their function is not ornamental repetition but strengthening assurance.
The listener is more than uninformed: they resist the likelihood of the claim. Thus the speaker uses a form that resembles a response to denial.