Whatever you have got in this material world, that is simply imitation, a shadow of the original....You can understand that in the desert sometimes it appears that there is a vast ocean of water, mirage. But actually there is no water. Those who are animals, they sometimes are misled. They are thirsty, and they think that there is water in the desert, and they run over, but actually there is no water. The animal runs, and the water also advances. In this way, when he becomes too much fatigued, he dies. This is the exact example of this material world. We are hankering after water, we are thirsty, and we are being misled by so-called water, mirage.
(Srila Prabhupada Lecture, Laguna Beach, 9/30/1972)