Surah Qaf (Qaf) 50 : 45

Explanatory Note

The surah finally reassures the Prophet so that he is not troubled by the unbelievers' denials of this truth and the arguments they make in disputing it: "We are fidly aware of what they say. You are not one to use coercion with them. Therefore, remind, with the Qur'an, those who fear My warning." 

It is sufficient for you to reassure yourselves that "We arefully aware of what they say." This is indeed an implicit warning of the consequences of this knowledge, which are bound to be terrible for them. "You are not one to use coercion with them." You cannot force them to believe in God. You have no power over them. That power belongs to God alone. "Therefore, remind, with the Qur'an, those who fear My warning." The Qur'an shakes people's hearts. No heart that is alert and sensitive will ever reject the truths presented in the Qur'an in its unique, remarkable style.

When a surah like this is presented, the matter does not require any mighty being to force people into submission to faith. The Qur'an has far greater power than all tyrants could possess. A surah like this can easily produce on people's hearts an effect far more powerful than their whips. Whatever God says is the absolute truth.