People don't notice whether ...

People don\'t notice whether it\'s winter or summer when they\'re happy.
People don't notice whether it's winter or summer when they're happy.

More phrases

If one does not know to which port one is sailing, no wind is favorable.
What a distressing contrast there is between the radiant intelligence of the child and the feeble mentality of the average adult.
We are masters of the unsaid words, but slaves of those we let slip out.
I have always found that mercy bears richer fruits than strict justice.
A lie gets halfway around the world before the truth has a chance to get its pants on.

Quotes from the same author

Love, friendship and respect do not unite people as much as a common hatred for something.
Knowledge is of no value unless you put it into practice.
My mother and father are the only people on the whole planet for whom I will never begrudge a thing. Should I achieve great things, it is the work of their hands; they are splendid people and their absolute love of their children places them above the highest praise. It cloaks all of their shortcomings, shortcomings that may have resulted from a difficult life.
To a chemist, nothing on earth is unclean. A writer must be as objective as a chemist; he must abandon the subjective line; he must know that dungheaps play a very respectable part in a landscape, and that evil passions are as inherent in life as good ones.
Man has been endowed with reason, with the power to create, so that he can add to what he's been given.