ভূমিকা
What the holy Qur'an says is divided here into 3 parts: First part: (clear verses). They are about the reasons of monotheism, stating the mission of prophets, the characteristics of Resurrection, stating the religious ordinances, whether they are obligatory or religiously prohibited or conventional, and fair virtues and other religious duties that are all clear and in line with wisdom and common good.
Second Part:It is about the life of past prophets and nations who gained their consequences as the result of Faith. It is also about those nations who were each chastised in a way because of corruption, polytheism, paganism, oppression, and denial of prophets. Third part: It consists of some advise, admonition, and exhortation, but only the pious uses and get profit from them because they accept them. And wrongdoers will be chastised because of their deeds.
It is often of no avail to give advice to the dark hearted persons. Their likeness is the iron nail which naturally does not go into a stone.