Srila Prabhupada - Vedic Teachings

                               Prabhupāda: We are seeking eternity. I find myself as a soul; I am eternal; so I must seek an eternal world. This is not my place. I am eternal. The same example: just like fish taken from the water, he is not finding comfortable life. So when the fish is thrown in the water, then it is comfortable. Similarly, I am spirit soul. I am not feeling comfortable with this material body. Therefore the right conclusion is how to go to the spiritual world or attain a spiritual body. That information we are getting from Bhagavad-gītā, that one who understands Kṛṣṇa or develops his love for Kṛṣṇa, how to see Kṛṣṇa, then he gets a spiritual body to see Kṛṣṇa. Because if one is very much anxious, these thoughts will continue, and at the time of his death, ending this body, if he is filled up with Kṛṣṇa consciousness, he is immediately transferred. (Philosophy Discussion on Immanuel Kant) ...

  „ Your coat is cut according to your body. Similarly, this materially body is cut according our spiritual body. So we have got our spiritual body. This material body is covering. Vāsāṁsi jirṇāni. Just like dress. Your shirt and coat is the covering of your real body. Similarly, this body, gross body and subtle body, made of material elements... The gross body is made of earth, water, air, fire. And the subtle body's made of mind, intelligence and ego. This is the shirt and coat. Within this shirt and coat, there is the soul. So the soul is now encaged in this material body. And our business in the human form of body. In animal form of body, we cannot do this. But the human form of body we can understand that "I am not this body." The body, this material body, is a outer encagement, and, because I have got this body, I am subjected to birth, death, old age and disease.” (Lecture on BG 4.13 -- New York, April 8, 1973)