This quote is written / told by Paul Samuelson somewhere between May 15, 1915 and today. He/she was a famous Economist from USA.
The author also have 14 other quotes.
"Nature gives to every time and season some beauties of its own; and from morning to night, as from the cradle to the grave, it is but a succession of changes so gentle and easy that we can scarcely mark their progress"