The truth is clear in this Qur’ān, and the argument Islam presents is clear and powerful. Anyone who knows Islam well but who still rejects it is only doing so because he prefers to pursue his own desires. Allah (God) says:
“But if they do not respond to you, then know that they are following only their own whims. Who could be more astray than one who follows his own whims without any guidance from God. Certainly God does not guide those who are wrongdoing.We have indeed caused this word [of Ours] to reach them so that they may reflect.” (Al-Qur’an surah Al-Qasas Ch.28:Verses 50-51)
There are only two ways: either commitment to the truth which breaks the grip of desire, and leads to submission and acceptance of the faith, or evading the truth and pursuing desire, which means rejecting the truth and denying faith. The unbelievers cannot present any argument on the basis of ambiguity, confusion or lack of proof. “But if they do not respond to you, then know that they are following only their own whims.” (Verse 50) This is a fact that allows no argument as it is clearly stated by God. Those who do not respond positively to this faith pursue their own desire and self-interest. They have no excuse. They offer no sound argument as they turn away from the truth.
“Who could be more astray than one who follows his own whims without any guidance from God.” (Verse 50) In this they are also transgressors and wrongdoers: “Certainly God does not guide those who are wrongdoing.” (Verse 50) The Qur’ān leaves no excuse for those who claim that they have not understood its message, or who claim that they do not comprehend Islam. Once this faith is presented and explained to them, all argument ceases and excuses are futile. The Qur’ān is indeed the epitome of clarity. No one denies it except those who are deliberate wrongdoers: they wrong themselves and are unjust to the truth. As such they do not deserve divine guidance: “God does not guide those who are wrongdoing.” (Verse 50) As the message is given to them, the issues are set out clearly and no excuse can be made for turning away: “We have indeed caused this word [of Ours] to reach them so that they may reflect.” (Verse 51)
Taken from In the Shade of the Qur’an Vol.13-page-195