Based on the statement of Ibn Al-Qayyim in the book Ighaathatul-Lahfaan (إغاثة اللهفان)

Introduction

1- Every organ in our body is created to carry out a specific task.

2- The perfection of each organ is reached when it performs the task specific to it. An organ is complete if it performs the task perfectly, and it is deficient if the task is performed deficiently. Moreover, if it does not perform the task specific to it, it is considered dead.

For example,

– Allaah created the hands to hold and grasp. When the hand fails to grasp, this indicates that the hand is not functioning well; there is a sickness and a deficiency in it.

– Allaah created the eyes for seeing. They are sound when they perform that task. However, if the vision becomes weak, this indicates a deficiency in the eyes, and if one cannot see at all, then this means that the eyes are dead.

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