Translation of the verse 68 from Surah Al-Kahf : Number of verses 110 - - page 301 - Part 15.
"And how can you have patience about a thing which you know not?"
And how can you have patience for what you do not encompass in knowledge?"
(18:68) and you cannot have the patience with regard to that matter of which you have no knowledge" .
Source : Al-Kahf Verse 68: And how can you have patience for what you do not encompass in knowledge?"