Like a boy who is accustomed to playing only, he cannot concentrate in his study, in understanding his future life or in elevating himself, a higher position. Similarly, if we are engaged like child without knowing the future of life, simply playing with the senses, that is called material life. The difference between material life and spiritual life is that if somebody is simply engaged in sense gratification business, that is called material life. And out of many thousands of such materialistic persons, if somebody is trying to understand, "What I am? Why I have come here? Why I am put into so many miserable condition of life? Is there any remedy?" these questions, when arises, then, practically, his spiritual life begins.
And the human form of life is meant for that. In animal life they do not know anything except sense gratification. They have no power. Their consciousness is not developed. Just like in the Green Lake park, there are so many ducks. As soon as somebody goes there with some little food, oh they gather, "Quack! quack! quack! quack!" (laughter) That's all. And after eating, they are enjoying sex life. That's all. So similarly, like cats and dogs and these animals, the human life is also like that if there is no question "What I am?" If they are simply directed by the sense urges, they are no better than these ducks and dogs.