Edna St. Vincent Millay Quote

When we are old and these rejoicing veins
Are frosty channels to a muted stream,
And out of all our burning there remains
No feeblest spark to fire us, even in dream,
This be our solace: that it was not said
When we were young and warm and in our prime,
Upon our couch we lay as lie the dead,
Sleeping away the unreturning time.

Collected Poems (ed. HarperCollins Publishers, 1956)