«رَبِّنَا عرفْنَاهْ بِالْعَقْلْ»

The saying answers someone who rejects a claim only because they have never witnessed it. It points out that belief in God rests on inference rather than sight, so dismissing everything unseen on that basis is inconsistent.

More broadly, it upholds reasoning as a valid route to knowledge: evidence and deduction can establish what direct observation cannot. It works as a conversational rebuke of selective doubt, not as a statement of theological doctrine.

Use it in reply to someone who refuses to accept anything they have not seen, urging them to weigh the evidence and reason it through. Because it invokes God, it suits listeners who share that belief and may feel out of place with others.