"Death is nothing to us. When we exist, death is not; and when death exists, we are not." - Epicurus.
“I do not fear death. I had been dead for billions and billions of years before I was born, and had not suffered the slightest inconvenience from it.” - Mark Twain
As far as death goes, Heidegger (a difficult read) does an excellent job arguing that death is what gives our life meaning. Here's a decent article on the topic.