Mythological books also known as holy books is related to god. Every religion has their own books like ramayana and mahabharata in hinduism , bible in christians, quran in muslims , guru granth sahib in sikhs. All these books are the source of different culture and tradition followed today. These books teaches us moral lessons like to respect our elders, speak truth, help the people in need etc. These book increases positivity in our mind so my suggestion is that everyone should read these books once during their life time.