Related quotes
“A happy soul, that all the way
To heaven hath a summer’s day.”
In Praise of Lessius’s Rule of Health, reported in Bartlett's Familiar Quotations, 10th ed. (1919).

“People don't notice whether it's winter or summer when they're happy.”
“Some stories don’t have happy endings. Even love stories. Maybe especially love stories.”
Source: The Nightingale
Neil Durden-Smith, BBC News 6 February 2010 http://news.bbc.co.uk/1/hi/entertainment/8502006.stm
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Heimsljós (World Light) (1940), Book Two: The Palace of the Summerland