There was a question in my mind: what is the difference between existence and absence? Then I thought of a comparison that was mentioned once by one of my teachers; some one who follows an ancient Indian philosophical tradition. Though he suggested this example for another occasion, I felt it would be useful in this context too. No advise from great teachers die, they exist and traverse continents, cultures and minds. The comparison offered by my teacher was for advising me about the worth of my being and the significance of being with others. When we talk to someone, we are locating his presence in the world of existence, through gestures, words, and emotions, which would then be continued through memories. But non-living things, such as rocks or fire never do this, my teacher had said. When some one communicates with us, we are brought into the realm of existence. But when we keep away from communication with others, or confine ourselves inside the barrier of seclusion, we create a...