„Wszystko jest trudne zanim stanie się proste.”
Thomas Fuller (1608–1661)
All things are difficult before they are easy. (ang.) <br class="br">Źródło: Gnomologia: Adagies and Proverbs; Wise Sentences and Witty Sayings, Ancient and Modern, Foreign and British http://books.google.pl/books?id=3y8JAAAAQAAJ, Londyn 1732, s. 21.