﴿ وَمَا كُنتَ تَتْلُوا۟ مِن قَبْلِهِۦ مِن كِتَٰبٍۢ وَلَا تَخُطُّهُۥ بِيَمِينِكَ ۖ إِذًۭا لَّٱرْتَابَ ٱلْمُبْطِلُونَ ﴾

“for, [O Muhammad,] thou hast never been able to recite any divine writ ere this one [was revealed], nor didst thou ever transcribe one with your own hand or else, they who try to disprove the truth [of thy revelation] might indeed have had cause to doubt [it].”

There are two types of individuals—one who already possesses a knowledge of the Truth and the other who apparently does not. However, the second type also are acquainted with the Truth at the level of their inherent nature. The former are the bearers of the book, while the latter draw on the resources of their own nature. If people are really sincere and serious, they recognize the Truth immediately. One group might recognize it as a Divine Book from heaven, while the other might recognize it as a Book of Nature. To each one, the Truth will manifest itself as a matter after his own heart. But, people often become enmeshed in a variety of psychological problems, due to which they adopt a rigid attitude of denial. They go on denying the Truth, even though there may be many factors in its support, and even if many arguments are advanced in its favour.