Translation:

77. Until We open on them a gate leading to a severe Punishment: then Lo! they will be plunged in despair therein!

Notes (Tafseer)

2923. Cf. vi. 44. If the little trials in the present life will not open their eyes, will great trials do so? Unfortunately they only cause in the wicked a feeling of despair. In the final Punishment after the Judgment, it will be too late for them to repent, and despair will be their only lot.