Due to having a physical aspect, a human is equipped with faculties that are tasked with prompting him to perform actions that ensure the fulfillment of material perfection and pleasure. However, since the true nature of a human is his spiritual aspect, naturally, his spiritual faculties should be the primary controllers of his actions, with the bodily faculties serving the spiritual faculties. In this case, the human moves towards true happiness. However, if the spiritual faculties of a human do not have full control over him, and he is somewhat influenced by his bodily faculties, or if the bodily faculties have complete control over him, he falls into 'practical lust'. This research, by examining the views of Ayatollah Javadi Amoli, aims to investigate two aspects of the condition to which a person becomes afflicted: 'the process of the influence of practical lust on human perceptions' and 'the effects and consequences of being afflicted by practical lust on human perceptions.' In the first section, it is stated how the inner proof of God for a person becomes weakened and leads to destruction when the person turns away from the external proof of God. In the second section, five results and consequences of the weakening of the inner proof, or the affliction of practical lust, on human perceptions are examined, which are: 'refusal to accept boundaries', 'loss of practical resolve', 'denial of God's sovereignty', 'creation of division in society', and 'falling into compound ignorance'. In this research, the method of gathering materials is library-based, and in the analysis of the materials, a descriptive-analytical approach has been followed.