“t's hard to say goodbye for good at any time or any place. It's harder still to say it through a meshed wire. It crisscrossed his face into little diagonals, gave me only little broken-up molecules of it at a time. It stenciled a cold, rigid frame around every kiss.”

Source: The Long Goodbye

Variant: The Clique: The only thing harder then getting in is staying in.
Source: Charmed and Dangerous: The Rise of the Pretty Committee

Say Goodbye to Hollywood.
Song lyrics, Turnstiles (1976)

1950s, Conquering Self-centeredness (1957)
Context: The individual who is self-centered, the individual who is egocentric ends up being very sensitive, a very touchy person. And that is one of the tragic effects of a self-centered attitude, that it leads to a very sensitive and touchy response toward the universe. These are the people you have to handle with kid gloves because they are touchy, they are sensitive. And they are sensitive because they are self-centered. They are too absorbed in self and anything gets them off, anything makes them angry. Anything makes them feel that people are looking over them because of a tragic self-centeredness. That even leads to the point that the individual is not capable of facing trouble and the hard moments of life. One can become so self-centered, so egocentric that when the hard and difficult moments of life come, he cannot face them because he’s too centered in himself. These are the people who cannot face disappointments. These are the people who cannot face being defeated. These are the people who cannot face being criticized. These are the people who cannot face these many experiences of life which inevitably come because they are too centered in themselves. In time, somebody criticizes them, time somebody says something about them that they don’t like too well, time they are disappointed, time they are defeated, even in a little game, they end up broken-hearted. They can’t stand up under it because they are centered in self.

Foge-me pouco a pouco a curta vida
(se por caso é verdade que inda vivo);
vai-se-me o breve tempo d'ante os olhos;
choro pelo passado e quando falo,
se me passam os dias passo e passo,
vai-se-me, enfim, a idade e fica a pena.
"Foge-me pouco a pouco a curta vida" http://www.poetryinternationalweb.net/pi/site/poem/item/8451, tr. Landeg White in The Collected Lyric Poems of Luis de Camoes (2016), p. 330
Lyric poetry, Sestina

Variant: Saying goodbye is a little like dying.
Source: Persepolis: The Story of a Childhood

Bk. IV, ch. 9
War and Peace (1865–1867; 1869)

Anna Letitia Barbauld, Life, in Lucy Aikin, ed., The works of Anna Laetitia Barbauld (1825), p. 261.

Source: How to Live on 24 Hours a Day