“It is the hour when from the boughs
The nightingale's high note is heard;
It is the hour when lovers' vows
Seem sweet in every whisper'd word.”
Parisina, Stanza 1, reported in Bartlett's Familiar Quotations, 10th ed. (1919).
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George Gordon Byron 227
English poet and a leading figure in the Romantic movement 1788–1824Related quotes

“Oh, weep for the hour
When to Eveleen's bower
The lord of the valley with false vows came.”
Eveleen's Bower.
Bartlett's Familiar Quotations, 10th ed. (1919)

An explanation of relativity which he gave to his secretary Helen Dukas to convey to non-scientists and reporters, as quoted in Best Quotes of '54, '55, l56 (1957) by James B. Simpson; also in Expandable Quotable Einstein (2005) edited by Alice Calaprice
William Hermanns recorded a series of four conversations he had with Einstein and published them in his book Einstein and the Poet (1983), quoting Einstein saying this variant in a 1948 conversation: "To simplify the concept of relativity, I always use the following example: if you sit with a girl on a garden bench and the moon is shining, then for you the hour will be a minute. However, if you sit on a hot stove, the minute will be an hour." ( p. 87 http://books.google.com/books?id=QXCyjj6T5ZUC&lpg=PP1&pg=PA87#v=onepage&q&f=false)
In the 1985 book Einstein in America, Jamie Sayen wrote "Einstein devised the following explanation for her [Helen Dukas] to give when asked to explain relativity: An hour sitting with a pretty girl on a park bench passes like a minute, but a minute sitting on a hot stove seems like an hour." ( p. 130 http://books.google.com/books?ei=yma3TsDWK8WciQL63smAAQ&ct=book-thumbnail&id=vs3aAAAAMAAJ&dq=sayen+%22einstein+in+america%22&q=pretty+girl#search_anchor)
Attributed in posthumous publications
Variant: When you are courting a nice girl an hour seems like a second. When you sit on a red-hot cinder a second seems like an hour. That's relativity.

“I wanted every word to last for hours, every gaze to last for days.”
Source: How They Met, and Other Stories

Source: Dictionary of Burning Words of Brilliant Writers (1895), P. 515.