Al-Kulaini, may Allah be pleased with him, cites on p.
Al-Kulaini, may Allah be pleased with him, cites on p. 273, Vol. 2, No. 20, of his work al-Kafi Zurarah citing Abu Ja'far peace be with him, saying, "Every servant of Allah has a white spot in his heart. When he commits a sin, blackness will enter into the white spot. If he repents, the blackness disappears, but if he keeps committing sins, the blackness keeps spreading till it covers the entire whiteness.
Once it covers the whiteness, this individual will never go hack to righteousness." It is the meaning of this verse: "But the [black] stain of the (ill) that they do is on their hearts" (Qur'an, 83:14), and perhaps the meaning of this narrative may bring to 'memory this verse: "Thus does Allah seal up the heart of every arrogant and obstinate transgressor" (Qur'an, 40:35). So, think about it and ponder.
He, peace be with him, is also quoted as haying said, "Hearts are of three types: a heart that is turned upside down, knowing no good: It is the heart of an apostate (kafir), a heart that has a black spot, goodness and evil in it wrestle with each other: whichever wins overtakes him, and an open heart; in it there is a lamp that shines; its light never goes out till the Day of Judgment: It is the heart of a believer." I is says "till the Day of Judgment" because this heart does not disintegrate when the body disintegrates; obedience to Allah polishes the heart, whHe disobeying Him blackens it." So, if the deeds are righteous and the rituals accepted, they have to hear an impact on the clarity of the heart, its 1700r and shine, The soundness of deeds, especially the rituals, has to meet the condition of being complete in their Parts and meeting their conditions as well as undertaken exclusively for the sake of seeking nearness to Allah Almighty.
If the deed lacks these conditions, when it lacks some of its parts or conditions, or if it is insincere, it may not instill noor into the heart, nor does it bear any impact on the heart's clarity and shine.
When we see in ourselves and in our hearts that performing the rituals is not having any effect on our hearts, when we sense no noor for them within nor any effect without, although .most or all of our worship meets the first condition, being inclusive of the parts and outwardly conditions, i.e. outwardly sound..., vet they lack the noor..., it is so on account of their lacking sincerity for Allah Almighty; otherwise, why do not we put an end to committing what is abominable and detested?