Muthabthabeena bayna thalika la ila haola-i wala ila haola-i waman yudlili Allahu (surah Nisa: 143)

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

(4:143) They dangle between the one and the other (faith and disbelief), and belong neither to these nor to those completely. And he whom Allah lets go astray, for him you can find no way. *173

Muzabzabeena baina zaalika laaa ilaa haaa` ulaaa`i wa laaa ilaa haaa`ulaaa`; wa mai yudlilil laahu falan tajida lahoo sabeela

*173). Here an important fact has been stated about the person who remained unguided to the Truth despite his acquaintance with the Book of God and with the life of His Prophet (peace be on him). He was a person who was so disinclined to the Truth and so infatuated with error that even God let him go forth along the same erroneous direction that he had chosen for himself, a person on whom the door of true guidance had been shut and the way towards error had been made smooth by God. It is virtually beyond the power of human-beings to direct such a person to the Truth.
We may be able to grasp this if we consider the case of man's livelihood. God controls all the sources of man's livelihood. Thus, anyone who receives any portion of livelihood receives it from God alone. At the same time, God grants every man livelihood through the means he has himself sought. If a man seeks his livelihood through lawful means and strives accordingly, God opens the door to honest living to him and closes the avenues of dishonest earnings in proportion to his earnestness. On the other hand, there is the person who is bent upon fattening himself on dishonest earnings and strives accordingly. God permits such a person to continue making an unlawful living, and no one has the power to help him secure an honest means of living.
The same applies to man's belief and conduct in this life. In this respect too, the ultimate control rests with God. No human being can proceed along any path, whether it be good or evil, unless God lets him proceed along it, and bestows upon him the means to do so. However, it is up to man himself to choose his own path, and after he has made the choice, God will let him proceed along it, and will even pave the way for him. If a person really cares about God, genuinely seeks the truth and earnestly tries to pursue the path charted by God, God permits him to follow his choice, and even provides the means necessary to proceed along his chosen path. On the other hand, God shuts the door of true guidance on the person who chooses error and strives to proceed only along wrong paths, and further enables him to follow the path of his choice. It is beyond the power of any human being to prevent such a person from thinking wrongly, acting wrongly and using up his energies in wrong directions. If a man loses the road to his success and is subsequently deprived of true guidance by God, in whose power does it lie, then, to restore to him his lost treasure?