The author of the book Haqa'iq Asrar al-Din (Truths of the Secrets of Religion) cited in its sixth chapter from the Master al-Sadiq—peace be from him—that he said:

We made them [the outward acts] for mankind like clothing; if one leaves them, he is naked. It is not proper for any of you to walk naked in the markets.

I say: Therefore, you will not see a single one from the Luminous Worlds who has reported that His (the Exalted) intent regarding the Mandated Fast is anything other than the preservation of God's secret, silence, and abstaining from it for those who are not its people.

The author of the book Haqa'iq Asrar al-Din (may Allah sanctify him) has graced us with what he cited in explaining the meaning of Fasting, saying:

{O you who have believed, decreed upon you is fasting as it was decreed upon those before you that you may become righteous} (Al-Baqarah 183).

And the Exalted said: {So say, "Indeed, I have vowed to the Most Merciful a fast, so I will not speak today to any human." Then she brought him to her people, carrying him. They said, "O Maryam, you have certainly done a thing unprecedented.