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wa-lladhīna kadhdhabū bi-ʾāyātinā ṣummun wa-bukmun fī ẓ-ẓulumāti man yashaʾi llāhu yuḍlilhu wa-man yashaʾ yajʿalhu ʿalā ṣirāṭin mustaqīmin
Those who deny Our signs are deaf and dumb, in a manifold darkness. Allah leads astray whomever He wishes, and whomever He wishes He puts him on a straight path.
— Ali Quli Qarai
Surah Al-‘An’am, Verse 39
39. "And those who belied Our Signs are deaf and dumb, in darkness; whomever Allah pleases He leads astray, and whomever He pleases, He sets him on a straight path."
It is true that both guidance and misguidance are in knowledge and power of Allah, but the will of man and the abilities existed in him are effective, too. Besides, the Will of Allah is also based on Wisdom. Holy struggle on the way of Allah is a cause for the Divine guidance, while being unjust toward people is a cause for misguidance. Therefore, infidelity and hostility are some darkness that causes separation from salvation. Concealing the Truth is counted dumbness and not hearkening it is deafness, and the fruit of people's rejection is misguidance and Allah’s wrath. The verse says:
However, paving the straight path needs a hearing ear, an impartial tongue and a transparent inward.