“Erring soul of man — if thou wast indeed forced to err, it shall surely be accounted to thee for good on that great day when the Mighty One shall descend in the clouds to judge the living dead and the dead who are yet alive!”

Source: A Dream of John Ball (1886), Ch. 12: Ill Would Change Be At Whiles Were It Not For The Change Beyond The Change.
Context: To thee, when thou didst try to conceive of them, the ways of the days to come seemed follies scarce to be thought of; yet shall they come to be familiar things, and an order by which every man liveth, ill as he liveth, so that men shall deem of them, that thus it hath been since the beginning of the world, and that thus it shall be while the world endureth... Yet in time shall this also grow old, and doubt shall creep in, because men shall scarce be able to live by that order, and the complaint of the poor shall be hearkened, no longer as a tale not utterly grievous, but as a threat of ruin, and a fear. Then shall these things, which to thee seem follies, and to the men between thee and me mere wisdom and the bond of stability, seem follies once again; yet, whereas men have so long lived by them, they shall cling to them yet from blindness and from fear; and those that see, and that have thus much conquered fear that they are furthering the real time that cometh and not the dream that faileth, these men shall the blind and the fearful mock and missay, and torment and murder: and great and grievous shall be the strife in those days, and many the failures of the wise, and too oft sore shall be the despair of the valiant; and back-sliding, and doubt, and contest between friends and fellows lacking time in the hubbub to understand each other, shall grieve many hearts and hinder the Host of the Fellowship: yet shall all bring about the end, till thy deeming of folly and ours shall be one, and thy hope and our hope; and then — the Day will have come.

The Third Part, Chapter 43, p. 330
Leviathan (1651)

Fragment xxiv.
Golden Sayings of Epictetus, Fragments

Quoted by Will Durant in On the Meaning of Life http://books.google.com/books?id=XH5HAAAAIAAJ&q=%22Either+the+soul+is+immortal+and+we+shall+not+die+or+it+perishes+with+the+flesh+and+we+shall+not+know+that+we+are+dead+Live+then+as+if+you+were+eternal%22&pg=PA53#v=onepage (1932)
Context: What shall we know of our death? Either the soul is immortal and we shall not die, or it perishes with the flesh and we shall not know that we are dead. Live, then, as if you were eternal, and do not believe that your life has changed merely because it seems proved that the Earth is empty. You do not live in the Earth, you live in yourself.

On Literature, Revolution, Entropy and Other Matters (1923)
Context: It is an error to divide people into the living and the dead: there are people who are dead-alive, and people who are alive-alive. The dead-alive also write, walk, speak, act. But they make no mistakes; only machines make no mistakes, and they produce only dead things. The alive-alive are constantly in error, in search, in questions, in torment.
The same is true of what we write: it walks and it talks, but it can be dead-alive or alive-alive. What is truly alive stops before nothing and ceaselessly seeks answers to absurd, "childish" questions. Let the answers be wrong, let the philosophy be mistaken — errors are more valuable than truths: truth is of the machine, error is alive; truth reassures, error disturbs. And if answers be impossible of attainment, all the better! Dealing with answered questions is the privilege of brains constructed like a cow's stomach, which, as we know, is built to digest cud.

Grand Chorus.
A Song for St. Cecilia's Day http://www.englishverse.com/poems/a_song_for_st_cecilias_day_1687 (1687)
Source: The Major Works
Context: So, when the last and dreadful Hour
This crumbling Pageant shall devour,
The trumpet shall be heard on high,
The dead shall live, the living die,
And musick shall untune the Sky.

139
Saint Genet, Actor and Martyr (1952)

Variant: Dead, but not allowed to die. Alive, but as good as dead.
Source: Mockingjay

Diary entry for the day he died (15 April 1888); from Ecclesiasticus, xxxviii
Matthew Arnold's Notebooks (1902)