Human life means voluntarily practicing suffering for the advancement of spiritual life. There is, of course, suffering in the lives of animals and plants, which are suffering due to their past misdeeds. However, human beings should voluntarily accept suffering in the form of austerities and penances in order to attain the divine life. After attaining the divine life, one can enjoy happiness eternally. After all, every living entity is trying to enjoy happiness, but as long as one is encaged in the material body he has to suffer different kinds of misery.