In fact, the fear of death is independent of all knowledge; for the brute has it, although it does not know death. Everything that is born brings it with it into the world. But this fear of death is a priori only the reverse side of the will to live, which indeed we all are.
 Arthur Schopenhauer, The World as Will and Representation (1819). copy citation

add
Author Arthur Schopenhauer
Source The World as Will and Representation
Topic death fear
Date 1819
Language English
Reference
Note Translated by R. B. Haldane and J. Kemp
Weblink http://www.gutenberg.org/files/40868/40868-h/40868-h.html

Context

“In the language of nature death means annihilation. And that death is a serious matter may be concluded from the fact that, as every one knows, life is no joke. We must indeed deserve nothing better than these two.
In fact, the fear of death is independent of all knowledge; for the brute has it, although it does not know death. Everything that is born brings it with it into the world. But this fear of death is a priori only the reverse side of the will to live, which indeed we all are. Therefore in every brute the fear of its destruction is inborn, like the care for its maintenance. Thus it is the fear of death, and not the mere avoidance of pain, which shows itself in the anxious carefulness with which the brute seeks to protect itself, and still more its brood, from everything that might become dangerous.” source