You know this person who based his belief upon the contents of Qur’an. He found that this Book is self-explanatory and that it comes from the Lord and like the Book of Moses (which was revealed before) is a guidance and the blessing from God for the believers. As for those who choose to disregard it, they will end up in the Hell as promised. Do not harbor any doubt about in your heart. Qur’an is Truth and revealed by your Lord. What a shame that most people do not realize it.