“There are two classes of men. One is called the kripana, and the other is called the brahmana. The kripana, or the miserly man, has no estimation of his material body, but the brahmana has a true estimation of himself and the material body. The kripana, having a wrong estimation of his material body, wants to enjoy sense gratification with his utmost strength, and even in old age he wants to become a young man by medical treatment or otherwise.” (Shrila Prabhupada, Shrimad Bhagavatam, 1.13.25 Purport)