Hazrat Qari Tayyib Saahib (rahmatullahi ‘alaih) explains that each limb receives its fulfilment in a different way. The tongue through tasting something that is appetizing and tasty, the nose through some pleasant smell, the ear through a soothing sound, the eye through a beautiful scene. None of these can be swopped around. You cannot expect to soothe the eye through a pleasant smell. Similarly, nor can you try to soothe the ear through a beautiful scene. Each limb needs to be given its respective form of fulfilment. So accordingly, is the condition of the heart. The heart also craves for its satisfaction and fulfillment. It has also got its own unique way of enjoyment like the rest of the limbs. The enjoyment of the heart lies in zikr. Nothing else can give it the satisfaction it needs besides zikr. Beautiful scenery, pleasant smells, tasty food and soothing sounds may satisfy their respective limbs but they can bring no joy to the heart. Going that route is rather foolish. When the heart is starved from zikr then does it fall into despondency and depression.