If a person’s heart is filled with the belief that Allah [Subhanahu wa Ta'ala] is watching him and can see him, and has forbidden what He has forbidden to him and will be angry with the one who does it and punish him, and if his heart is filled with the belief in the reward and punishment, Paradise and Hell, then he will not fail to act upon this knowledge.


[Ibn al-Qayyim (may Allah have mercy on him)]