What is the significance of Epicurus' death quote in relation to his philosophy on living a happy and fulfilling life?

Epicurus' death quote, "Death does not concern us, because as long as we exist, death is not here. And when it does come, we no longer exist," reflects his philosophy that death is not to be feared as it is simply the absence of consciousness. This belief allows individuals to focus on living a happy and fulfilling life without being consumed by the fear of death.