It's an adversarial world outside of the safety of nirvana and enlightenment. In life, all beings need to feed on other beings just in order to exist. Some beings also like to cause others to needlessly suffer, just out of pure maliciousness
Frederick LenzIn meditation, when your thoughts are stopped, you become empty. When you are empty, your mind folds back on itself and you see through the illusions of the material world.
Frederick Lenz