Srila Prabhupada Arrival Lecture -- Los Angeles, May 18, 1972

His Divine Grace A.C. Bhaktivedanta Swami Prabhupāda (ISKCON Founder Acharya)--
So our Krishna consciousness movement is very scientific, factual, authorized. Simply intelligent persons can understand it. Every human being has got intelligence, better than the animals. If you simply try to understand what is this Krishna consciousness movement, this human life will be perfect. Here, we are trying to enjoy, but we do not know that next life, next chapter, may stop everything—at any moment. Don't think because you are American, you have got material opulences, very comfortable life, cars, roads, buildings... That's all right. But any moment, you will be kicked out, and it may be that you'll have to accept another body which is not at all American. It may be the body of a tree or a cat or a dog. That science we must know. Don't be enamored by the flickering happiness. This happiness is there which is factual: this Rādhā-Krishna. 
(Arrival Lecture -- Los Angeles, May 18, 1972)