Imam explains the matter in his famous book "combat with the self" as following:
According to the order of the Holy Apostle, peace be upon him and his progeny, (which is related in one of his sermons) all of the servants of God, the Supreme, have been invited by Him to a feast in the blessed month of Ramadan and are to be the guests of the Provider at His feast. He says there: “O you people! The month of Allah is approaching you…and you have been invited in it to the feast of Allah.”
In this few days until the blessed month of Ramadan, you should reflect, reform yourselves, and pay attention to God Almighty, seek forgiveness for your unbecoming behavior and deeds, and if, God forbid, you have committed a sin, repent for it prior to entering the blessed month of Ramadan. Habituate your tongue to intimate devotions [munajat] to God the Almighty.
God forbid that in the blessed month of Ramadan you should backbite or slander, or in short, sin, and so become polluted by transgression in the presence of the Lord, the Exalted, at His feast. You have been invited during this honorable month to the banquet of God the Almighty, “and you have been invited in it to the feast of Allah,” so, get yourself ready for the magnificent feast of the Almighty.
At least respect the formal and exoteric manners of fasting. (The true manners of fasting are another matter entirely, and require constant care and effort.) The meaning of fasting is not merely refraining from eating and drinking, one must also keep oneself from sin. This is the primary etiquette of fasting for novices. (The etiquette of fasting for divine people who want to reach the mine of greatness is other than this.), Imam futher explained.
You should at least observe the primary etiquette of fasting, and in the same way that you refrain from eating and drinking, you should keep your eyes, ears and tongue from transgression. From now on, keep your tongue from backbiting, slander, speaking bad, and lies, and expel from your hearts all spite, envy, and other ugly satanic attributes. If you are able, cut yourself off from all but Allah. Perform your deeds sincerely and without duplicity.
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Imam advised believers to accept responsibilities of blessed month of Ramadan
Cut yourselves off from the Satans among humans and the jinn, although we ourselves apparently cannot aspire to reaching such a valuable state of felicity. At least try to see to it that your fast is not accompanied by sin. Otherwise, even if your fast is correct from the point of view of Islamic law, it will not ascend to be accepted by God. There is a big difference between the ascension of one’s works and their acceptance on the one hand, and their religious correctness on the other.
If, by the end of the blessed month of Ramadan, there is no change in your works and deeds, and your ways and manners are no different than they were before the month of fasting, it is evident that the fast which you were expected to perform was not realized, and that which you have done is no more than a vulgar physical fast.
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