Material knowledge means ignorance of the knowledge of one's own self. Philosophy means to seek after the right knowledge of one's own self, or the knowledge of self-realization. Without self-realization, philosophy is dry speculation or a waste of time and energy. Srimad-Bhagavatam gives the right knowledge of one's own self, and by hearing Srimad-Bhagavatam one can get free from material attachment and enter into the kingdom of fearlessness. This material world is fearfulness. Its prisoners are always fearful as within a prison house. In the prison house no one can violate the jail rules and regulations, and violating the rules means another term for extension of prison life. Similarly, we in this material existence are always fearful. This fearfulness is called anxiety. Everyone in the material life, in all species and varieties of life, is full of anxieties, either by breaking or without breaking the laws of nature. Liberation, or mukti, means getting relief from these constant anxieties. This is possible only when the anxiety is changed to the devotional service of the Lord. Srimad-Bhagavatam gives us the chance to change the quality of anxiety from matter to spirit. This is done in the association of a learned philosopher like the self-realized Sukadeva Gosvami, the great son of Sri Vyasadeva. Maharaja Pariksit, after receiving warning of his death, took advantage of this opportunity by association with Sukadeva Gosvami and achieved the desired result.