“Life isn't a matter of milestones, but of moments.”
“Isn't life,' she stammered, 'isn't life--' But what life was she couldn't explain. No matter. He quite understood.
'Isn't it, darling?' said Laurie.”
Source: The Garden Party and Other Stories
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Katherine Mansfield 43
New Zealand author 1888–1923Related quotes

“Life isn't fair,' Skulduggery said. 'In my experience, death isn't so different.”
Source: Death Bringer

“Art isn't meaningless… It is in itself. It isn't in that it tries to make life less so.”
Source: The Beautiful and Damned

Though Woods might have used this phrase, it is one dating at least to the early 20th century; the earliest published use thus far located is in "Mr. Lyncargo's Professional, by Frank Savile, in The Badminton Magazine of Sports and Pastimes (1906), p. 498, where a character declares : "Life isn't all golf. There are other duties, sometimes."
Misattributed

“This isn't life in the fast lane, it's life in the oncoming traffic.”
Usenet
“Love isn't an act, it's a whole life.”