At the time of death a materialist thinks of his wife and children. He is absorbed in thinking of how they will live and who will take care of them after he leaves. Consequently he is never prepared to give up his body; rather, he wants to continue to live in his body to serve his society, family, friends and so on. Therefore by practicing the mystic yoga system one must become detached from bodily relationships. If despite practicing bhakti-yoga and studying all the Vedic literature, one is afraid of giving up his bad body, which is the cause of all his suffering, what is the use of his attempts to advance in spiritual life? The secret of success in practicing yoga is to become free from bodily attachments. Srila Narottama dasa Thakura says, deha-smrti nahi yara, samsara-bandhana kahan tara: one whose practice has freed him from the anxieties of bodily needs is no longer in conditional life. Such a person is freed from conditional bondage. A person in Krsna consciousness must fully discharge his devotional duties without material attachment. Then his liberation is guaranteed.