How can we trust our minds in proving the existence of God and the revelation of the Quran, and what is the extent of our certainty regarding the soundness of our minds and their rational premises in reaching complete faith? Is complete certainty only achieved upon death, as in His Almighty’s saying: "And worship your Lord until there comes to you the certainty (death)"?

It is difficult to conceive of pure falsehood; it must carry an internal contradiction that reveals its invalidity, like someone who uses reason to argue against the possibility of knowledge through reason, which leads to an impossible circularity. This approach is dangerous, leading to doubt in intellectual axioms and self-evident truths. A sound intellect, aligned with innate disposition (fitra) and sensory perception, is a source of valid judgment. Messengers and scriptures have affirmed it. Thus, faith benefits from the convergence of innate disposition, intellect, and divine law (Shari'a). As for the verse (And worship your Lord until there comes to you the certainty), "certainty" here refers to death, which no one doubts will occur, and it does not mean that complete faith is only achieved at the presence of death.