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The most excellent fasting is to make the human senses and organs, such as the eyes, ears, heart, and mind, fast together with the stomach.
That is, to withdraw them from unlawful things and from trivia, and to urge each of them to their particular worship.
For example, to ban the tongue from lying, back-biting, and obscene language, thus making it fast, and to busy it with such activities as reciting the Qur’an, praying, glorifying Allah’s Names, asking for Allah’s blessings for the Prophet Muhammad (blessings and peace be upon him), and seeking forgiveness for sins. And for example, to prevent the eyes looking at strangers [of the opposite sex], and the ears from hearing bad things, and to use the eyes to take lessons and the ears to listen to the truth and to the Qur’an – similarly making other organs fast too.
As a matter of fact, since the stomach is the largest factory, when it has an enforced holiday from work through fasting, the other small workshops are made to follow it easily.
Imam Bediuzzaman Said Nursi, Eighth Point, The Twenty-Ninth Letter