The whole matter is explained by Rumi in his Masnavi, "Our life on earth is as a captivity, an imprisonment." An imprisonment in what? In a physical body which covers the light of the soul. And the mind is also helplessly attached to the body. It is the bodily desires, passion, anger, appetite, all the different desires and needs, that make the mind helpless and make man hold on to them. All the worries, anxieties, depressions, and despairs arise from them. There is not a single moment in which the mind is able to stand aloof so as to reflect the light within, the light of the soul, so limited has it been made by the limited existence on earth. In reality this is the whole tragedy of human life.