Bismillahir Rahmaanir Raheem
"Sins leave ugly, despicable and harmful
effects to the heart and body, in this world and the next.
...From them is that
one is prevented from knowledge, as knowledge is a light that Allah Ta’ala places
in the heart, and sins extinguish this light."
Ibn Al-Qayyim
(Rahmatullahi 'alayh)