One of the many instances of wisdom in Ramadan from the point of view of man's personal life is as follows:
It is a healing physical and spiritual diet of the most important kind. When man's instinctual soul eats and drinks just as it pleases, it is both harmful for man's physical life from the medical point of view, and when it hurls itself on everything it encounters without considering whether it is licit or illicit, it quite simply poisons his spiritual life. Further, it is difficult for such a soul to obey the heart and the spirit. It wilfully takes the reins into its own hands, and then man cannot ride it, it rather rides man. But by means of fasting in Ramadan, it becomes accustomed to a sort of diet. It tries to discipline itself and learns to listen to commands.
Furthermore, it will not be attracting illness to that miserable, weak stomach by cramming it with food before the previous consignment has been digested. And by abandoning even licit actions as it is commanded, it will acquire the ability to listen to the commands of the Shari'a and the reason, and so to avoid illicit actions. It will try not to destroy his spiritual life.
Moreover, the great majority of mankind frequently suffer from hunger. Man, therefore, needs hunger and discipline, which are training for patience and endurance. Fasting in Ramadan is patient endurance of a period of hunger that continues for fifteen hours, or for twenty-four if the pre-dawn meal is not eaten, and it is a discipline and a training. That is to say, fasting is also a cure for impatience and lack of endurance, which double man's afflictions.
Futhermore, the factory of the stomach has many workers. And many of the human organs are connected to it. If the instinctual soul does not have a rest from activity during the day for a month, it makes the factory's workers and those organs forget their particular duties. It makes them busy with itself so that they remain under its tyranny. Also, it confuses the rest of the organs in the human body with the clangour and steam of the factory's machinery. It continuously attracts their attention to itself, making them temporarily forget their exalted duties. It is because of this that for centuries those closest to God have accustomed themselves to discipline and to eating and drinking little in order to be perfected.
However, through fasting in Ramadan the factory's workers understand that they were not created for the factory only. While the rest of the organs, instead of delighting in the lowly amusements of the factory, take pleasure in angelic and spiritual amusements, and fix their gazes on them. It is for this reason that in Ramadan the believers experience enlightenment, fruitfulness, and spiritual joys which differ according to their degrees. Their subtle faculties, such as the heart, spirit, and intellect, make great progress and advancement in that blessed month by means of fasting. They laugh with innocent joy inspite of the stomach's weeping.
Bediuzzaman Said Nursi / Risale-i Nur Collection / The Letters