“From an evolutionary point of view, most emotions - fear, desire, anger - serve some practical purpose, but nostalgia is a useless, futile thing because it is a longing for something that is permanently lost….”
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David Nicholls 79
British writer 1966Related quotes

Source: Living Beyond Your Feelings: Controlling Emotions So They Don't Control You

Os sentimentos que mais doem, as emoções que mais pungem, são os que são absurdos – a ânsia de coisas impossíveis, precisamente porque são impossíveis, a saudade do que nunca houve, o desejo do que poderia ter sido, a mágoa de não ser outro, a insatisfação da existência do mundo. Todos estes meios tons da consciencia da alma criam em nós uma paisagem dolorida, um eterno sol-pôr do que somos.
The Book of Disquietude, trans. Richard Zenith, text 196

New York Times Magazine, December 20, 1964.
1960s
Source: Short fiction, Midsummer Century (1972), Chapter 10 (p. 78)

Vorkosigan Saga, Shards of Honor (1986)
Context: The really unforgivable acts are committed by calm men in beautiful green silk rooms, who deal death wholesale, by the shipload, without lust, or anger, or desire, or any redeeming emotion to excuse them but cold fear of some pretended future. But the crimes they hope to prevent in that future are imaginary. The ones they commit in the present — they are real.

On the title of her book Love (2003), in O, The Oprah Magazine (November 2003) http://www.oprah.com/omagazine/200311/omag_200311_toni_b.jhtml
Context: It is easily the most empty cliché, the most useless word, and at the same time the most powerful human emotion — because hatred is involved in it, too. I thought if I removed the word from nearly every other place in the manuscript, it could become an earned word. If I could give the word, in my very modest way, its girth and its meaning and its terrible price and its clarity at the moment when that is all there is time for, then the title does work for me.