“To acquire knowledge, one must study; but to acquire wisdom, one must observe.”
As quoted in Courage: the heart and spirit of every woman : reclaiming the forgotten virtue (2001) by Sandra Ford Walston
As quoted in "10 Questions for Elie Wiesel" by Jeff Chu in TIME (22 January 2006) http://www.time.com/time/magazine/article/0,9171,1151803,00.html
Context: I believe mysticism is a very serious endeavor. One must be equipped for it. One doesn't study calculus before studying arithmetic. In my tradition, one must wait until one has learned a lot of Bible and Talmud and the Prophets to handle mysticism. This isn't instant coffee. There is no instant mysticism.
“To acquire knowledge, one must study; but to acquire wisdom, one must observe.”
As quoted in Courage: the heart and spirit of every woman : reclaiming the forgotten virtue (2001) by Sandra Ford Walston
translation from original Dutch: Fons Heijnsbroek
(original Dutch: citaat van Willem Roelofs, in het Nederlands:) ..groote moeite kost het [me om] bij het maken van een schilderij naar een studie, deze werkelijk goed te volgen. Men is maar al te zeer geneigd, er iets anders, zoogenaamd iets beters, van te maken, en daardoor geraakt men meestal juist van de wijs. Een goede buiten-studie heeft een adem der natuur in zich, dien men niet mag verwaarloozen of vernietigen. Men moet uit zo'n studie alles halen, wat er in zit en niet een derde of de helft. Kan men waarlijk het een of ander verbeteren, a la bonheur, maar anders is het raadzaam, de studie gehoorzaam te volgen als gids.
Quote of Roelofs; recorded and cited by his student nl:Frans Smissaert in 1891, as quoted in Zó Hollands - Het Hollandse landschap in de Nederlandse kunst sinds 1850, Antoon Erftemeijer https://www.franshalsmuseum.nl/wp-content/uploads/2017/12/zohollands_eindversie_def_1.pdf; Frans Hals museum | De Hallen, Haarlem 2011, p. 16
undated quotes
Timoleon http://digitalcommons.unl.edu/cgi/viewcontent.cgi?article=1018&context=libraryscience, Art (1891)
Source: Education as a Science, 1898, p. 288.
Excerpt from speech delivered at the 74th commencement of the Albany Law School on June 10, 1925, which is reproduced on a gigantic plaque on the west side (facing the setting sun, as if to say, "Go West, young man.") of the UC Berkeley School of Law's main building, Boalt Hall.
Other writings
In Search of the Miraculous (1949)
The portion of the Integral Calculus, which properly belongs to any given portion of the Differential Calculus increases its power a hundred-fold...
The Differential and Integral Calculus (1836)