This is the characteristic of a Vaisnava. Para-duhkha-duhkhi: a Vaisnava is always unhappy to see the conditioned souls unhappy. Otherwise, he would have no business teaching them how to become happy. In materialistic life, people must certainly engage in activities of animosity. Materialistic life is therefore compared to samsara-davanala, a blazing forest fire that automatically takes place. Lord Siva and his followers in the parampara system try to save people from this dangerous condition of materialistic life. This is the duty of devotees following the principles of Lord Siva and belonging to the Rudra-sampradaya. There are four Vaisnava sampradayas, and the Rudra-sampradaya is one of them because Lord Siva (Rudra) is the best of the Vaisnavas (vaisnavanam yatha sambhuh). Indeed, as we shall see, Lord Siva drank all the poison for the benefit of humanity.