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Fourthly: In this is an indication for urging Ahl al-Kitâb to îmân, making it familiar and easy to them. It is as though it says: “O Ahl al-Kitâb! There should not be any difficulty in entering this way, for you are not casting away your shell, but only completing your beliefs and building on the fundamentals you already possess.” Because the Qur'an equalizes and perfects the fundamentals and aqâid; it combines in itself the virtues of all the previous books and the essentials of all the previous Sharî’ahs. It only establishes new ordinances in secondary matters, which are subject to change due to differences in time and place. Because just as with the change of seasons, food and dress and many other things are changed, and the manners of education and tarbiyyah change according to the stages of a person's life, in the same way, hikmah and benefit necessitate that religious laws concerning secondary matters change according to the stages of mankind's life. For very many of these are beneficial at one time yet harmful at another, and very many medicines were efficacious in mankind's infancy yet ceased being beneficial in its youth. This is the reason the Qur'an abrogated some of its secondary pronouncements. That is, it decreed that their time had finished and that the turn had come for other decrees.