Abd-Allāh ibn Mubārak [may Allāh have mercy on him] said:
“Among the greatest calamities which can inflict a person, is that he knows that he is negligent [towards his religious obligations] but he does not mind nor does he grieve over it.”
Shu’ab ul-Ēmān 2/271 | Abd-Allāh ibn Mubārak [may Allāh have mercy on him]