Prabhupāda: By chanting, you gradually cleanse your heart and you can realize what is God. That is the greatest gain. Human life is meant for knowing God. The animals, they cannot know, although the bodily demands of the animal and the human being are the same. The animals, they sleep; man also sleeps. Animal, they eat; man also eats. The animal, they are also afraid of some enemy; man is also afraid of some enemy. The animals, they mate with the opposite sex, and men also do that. But what is the special significance of man? He can understand about God, but the animal cannot.