Wama kana linafsin an tu'mina illa bi-ithni Allahi wayajAAalu arrijsa AAala allatheena (surah Yunus: 100)

Tafseer Tafheem-ul-Quran by Syed Abu-al-A'la Maududi

(10:100) No one can believe except by Allah's leave, *103 and Allah lays abomination on those who do not use their understanding. *104 and conduct.

Wa maa kaana linafsin an tu`mina illaa bi iznil laah; wa yaj`alur rijsa `alal lazeena laa ya`qiloon

*103). All God's bounties are solely at His disposal and one can neither have access to any of these without His leave, nor can one confer them on others. The bounty of having faith and being directed to the right path is also fully contingent upon God's leave. Hence, it is simply inconceivable that without God's leave anyone can attain this bounty or confer it on anyone else. Even if the Prophet (peace be on him) sincerely wants people to believe, it does not lie in his power to accomplish that without God's leave and succour.
*104). This fully explains that God's leave and succour are not bestowed on people arbitrarily. God does not capriciously permit or disallow people to embrace faith. There is a definite law - a law that is based on wisdom - according to which God disposes such matters. The law is that those who in their quest for the truth use their reason properly, and in an unbiased manner, are assisted by God. Owing to God's concern, the means of arriving at the truth are made available to them in proportion to the extent of the sincerity of their quest for the truth and their efforts to reach it. They are also granted the succour required for their success in grasping the truth. As for those who are not really in search of the truth, who keep their reason enmeshed in biases, or fail to make use of their reason in their search for the truth, such people are able to find nothing but the abomination of ignorance and misguidance, of false thinking and evil-doing. Their attitude makes it very clear that they merit nothing but ignorance and misguidance and, hence, that is what they are destined for.