“Fasting (sawm) is the third pillar of Islam. Right from dawn till dusk, a man who is strictly on a fast will neither eat so much as one morsel of food nor drink so much as one drop of water. By submitting to this discipline, that is, by depriving himself of the prime necessities of life, he learns the valuable lesson of fortitude. With no food and drink, he naturally feels hungry and thirsty, and his strength begins to ebb. The entire routine of his life is severely disturbed and his whole system is upset. But, out of a high sense of discipline, he braves all these difficulties and discomforts, and, remaining alert and never losing heart, he steadfastly discharges his duties. Food and drink may be temptingly placed before him, but, despite an overwhelming urge to have both, he will not even touch them. In this way, he prepares himself for a well-regulated and responsible life, doing only what is his duty and refraining from pernicious acts and habits. He is thus strengthened to continue with his mission in life, no matter how he may be beset by adversity.
God has endowed man with innumerable gifts, but, all too often, he takes them for granted without any feelings of gratitude. Countless benefits like the air, the sun, the water, have been showered upon man, the absence of anyone of which would cast his delicately balanced system into a living hell. But because he has received these things without any effort on his part, he sets no great value upon them, and hardly ever stops to ponder upon how they came to be his.
It is only when fasting temporarily curbs the satisfying of his desires that his consciousness of the value of these divine gifts is awakened. When, at sunset, after a whole day’s hunger, thirst and the accompanying discomfort and fatigue, a man begins to eat and drink, he becomes fully aware of his utter dependence on God’s bounty. He is then filled with gratitude towards God and the realization comes to him that, even were he to lay down his life for this Bountiful Creator, the price he should have to pay would not be too high.
The life of believer in this world is one of fortitude and forbearance, limited as it is to the enjoyment of whatever is allowed by God and avoidance of whatever is forbidden by Him. It will naturally be beset by all the difficulties encountered in the path of righteousness and truth, and the believer must staunchly face up to them. Much of his time must be given to such activity, and no precious moment can be wasted in stooping to revenge himself upon adversaries who have made him object of their spite and malice. On the contrary, the slights and injuries of this world should leave him undaunted; he should be able simply to take such untoward incidents in his stride so that he may continue unflinchingly to discharge his duties. Whenever his pride has been hurt, or whenever some unpleasantness has left him in a state of agitation, he must guard against adopting a negative attitude – for this is sheer weakness! – and must continue to devote his energies in a positive manner to worthy objectives. Nothing, in fact, should stop him, or even slow him down in his progress towards the Hereafter.
All of this demands enormous fortitude, and, without it, no one can travel along the path of Islam. The annual month-long period of fasting builds up the strength of character which is essential, if devout Muslims are to tread the path of righteousness for the rest of the year, avoiding impatience, cruelty and all such evil acts, and making no attempt to meddle with divine commandments. While in its outward form, fasting means abstinence from food and drink for a given period, in essence, it is training for a whole life of self-denial, inculcating patience, fortitude and forbearance”
[Wahiduddin Khan, Islam, the Voice of Human Nature, pp.68-71].