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.