Pour accomplir de grandes choses il ne suffit pas d’agir il faut rêver; il ne suffit pas de calculer, il faut croire.
To accomplish great things we must not only act, but also dream; not only plan, but also believe.
— Anatole France
from Discours de réception, Séance De L’académie Française (introductory speech at a session of the French Academy), 24th December 1896, on Ferdinand de Lesseps’ work on the Suez Canal (per WikiQuote)
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Quote courtesy of Crystal Swain.