But if the life be good, the negation of it must be bad.
 William James, The Varieties of Religious Experience (1902). copy citation

Context

“Truly the light is sweet, and a pleasant thing it is for the eyes to behold the Sun: but if a man live many years and rejoice in them all, yet let him remember the days of darkness; for they shall be many.” In short, life and its negation are beaten up inextricably together. But if the life be good, the negation of it must be bad. Yet the two are equally essential facts of existence; and all natural happiness thus seems infected with a contradiction. The breath of the sepulchre surrounds it. To a mind attentive to this state of things and rightly subject to the joy-destroying chill which such a contemplation engenders, the only relief that healthy-mindedness can give is by saying:” source