The similitude of such is when you come home and see your loved one in tears, the whimpering kind. Your first instinct is to drop everything and speak and comfort the person so they can smile to see the next day.
Our soul yearns for the hereafter, it feels lonely in this earth. Therefore it thrives on memories of the promised land through reflection and reminder. Its like reminicising with a guy who is from Madinah but lives in Karachi on the good "life" (same thing like talking to a guy who lives in Toronto but he is from Vancouver, no contest) lol. Our soul is similar in that, it smiles when reminded of the good after "life", and cries when its deprived. By depriving the soul from this reflection, you deny its access to beauty, and force it to settle to the misery of the temporal world. Our feelings of guilt, hope, and fear then start to wash away. Its result = a hard heart, a soul that hates to love, a blind eye, a deaf ear, a confused mind, and a sour life.