“Inna hādhā la-huwa ḥaqqu al-yaqīn”
“This indeed is the very truth of certainty.” (al-Wāqiʿah 56:95)
“Ḥaqq” and “yaqīn” both contribute to the idea of truth and certainty, yet the construct phrase creates a forceful affirmation of the reality under discussion. The expression is more emphatic than a bare assertion that something is true.
A paraphrase such as “certain reality” helps comprehension but should not erase the two words and their construction. The important point is how nominal form and syntactic linkage intensify the meaning.
A reader should ask what the verse is emphasizing before substituting one generic word for the expression.