But in the end one also has to understand that the needs that religion has satisfied and philosophy is now supposed to satisfy are not immutable; they can be weakened and exterminated. Consider, for example, that Christian distress of mind that comes from sighing over ones inner depravity and care for ones salvation - all concepts originating in nothing but errors of reason and deserving, not satisfaction, but obliteration.
Nietzsche: Human, All Too Human: A Book for Free Spirits (ed. Cambridge University Press, 1996) - ISBN: 9780521567046