R. Chanan Morrison, Gold from the Land of Israel, p. 208:
Rav Kook wrote:Death is a false illusion; its defilement is due to its deceptive nature. What people call "death" is in fact the intensification of life. Because man wallows in pettiness, he pictures this increase of life in a pained, black fashion, which he calls "death."The kohanim in their holiness are able to rise above this falsehood. Yet, falsehood and deception rule over the world. In order to overcome the illusion of death, the kohanim must limit their exposure to death. They need to protect themselves from those images that impress the soul with deceiving messages.