“There is no such thing as a happy ending. Every culture has a maxim that makes this point, while nowhere in the Universe is there a single gravestone that reads 'He Loved Everything About His Life, Especially the Dying Bit at the End'.”

The Christian has still to work, with mind as well as body, to suffer, hope, and die; but he may now perceive that all his bents and faculties have a purpose, which can be redeemed. So great is the bounty with which he has been treated that he may now, perhaps, fairly dare to guess that in Fantasy he may actually assist in the effoliation and multiple enrichment of creation. All tales may come true; and yet, at the last, redeemed, they may be as like and unlike the forms that we give them as Man, finally redeemed, will be like and unlike the fallen that we know.
On Fairy-Stories (1939)

Source: The Drawing of the Three

The Common School Journal, Vol. V, No. 19 (2 October 1843)

Source: The Nightingale

19th April 1826.
Zibaldone (1898)

Un Art de Vivre (The Art of Living) (1939), The Art of Growing Old

Campbell follows with a quote from Ovid's Metamorposes, "All things are changing; nothing dies..."
Chapter 2
The Hero with a Thousand Faces (1949)
Context: The happy ending of the fairy tale, the myth, and the divine comedy of the soul, is to be read, not as a contradiction, but as a transcendence of the universal tragedy of man.... Tragedy is the shattering of the forms and of our attachment to the forms... the two are the terms of a single mythological theme... the down-going and the up-coming (kathados and anodos), which together constitute the totality of the revelation that is life, and which the individual must know and love if he is to be purged (katharsis=purgatorio) of the contagion of sin (disobedience to the divine will) and death (identification with the mortal form).