“In the Bhagavad-gita (13.9) it is stated, janma-mrityu-jara-vyadhi-duhkha-doshanudarshanam: one who is actually advancing must always consider the four principles of miserable life, namely, birth, death, old age and disease. One cannot be saved from all these miseries unless he takes shelter of the lotus feet of the Lord.” (Shrila Prabhupada, Chaitanya Chairtamrita, Adi 7.1 Purport)