Accustom yourself to the realization that death concerns us not at all. For good and bad exist only by being perceived, and death deprives us of perception. Once we understand this truth, that death does not concern us, even our mortality becomes a source of pleasure; we give up our attempts to add eternity to our span of life here, and can abandon our vain longing for immortality. Life holds no terrors for him who realizes that there are none in death. This worst of horrors, the fear of death, affects us not at all; for while we are, death is not, and when death is, we are not.
By Epicurus, Letter, quoted in Diogenes Laertius 10 (via senjukannon)