I have already spoken of the Salat. Next in order is worship in the shape of the fast. It is a pity that some who call themselves Muslims at this time desire to modify these forms of worship. They are blind and are not aware of the perfect wisdom of God Almighty. These forms of worship are essential for the purification of the spirit. These people seek to intervene absurdly in a sphere of which they have no knowledge and devise false schemes for the improvement of a territory that they have not visited. Their lives are devoted to worldly affairs; of spiritual matters they have no notion. To be moderate in eating and drinking and to bear hunger and thirst are necessary for the purification of the spirit and promote the capacity for visions. Man does not live by bread alone. To discard all thought of eternal life is to invite Divine wrath.
It should be remembered that the fast does not mean merely that a person should abstain from food and drink over a certain period. During the fast one should be occupied greatly with the remembrance of God. The Holy Prophet (peace and blessings of Allah be on him) occupied himself greatly with worship during the month of Ramadan. During that month one should discard one’s preoccupation with eating and drinking; and cutting asunder from these needs should address oneself wholly towards God. Unfortunate is the person who is bestowed material bread and pays no attention to spiritual bread. Material bread strengthens the body, and spiritual bread sustains the soul and sharpens the spiritual faculties. Seek the grace of God, as all doors are opened by His grace.
(Essence of Islam, Vol. 2, p. 316)