Nooraaniyat (i.e. the Noor of Imaan) is extinguished by association with kuffaar and fujjaar (immoral persons). Zulmat (spiritual darkness) then develops. The knowledge which emanates from the niches of Nubuwwat contain Noor, and what emerges from the heart of a faasiq is zulmat.
[Malfoozaat Hakeemul Ummat – Hazrat Moulana Ashraf Ali Thanwi Rahimahullah]