Yesterday's Answer, Today's Question

Yesterday's Answer:

William Henry Harrison, the ninth U.S. President had the shortest presidency?

I had the right circumstances but the wrong name in my guess. Here is a quote from the Whitehouse.gov website about our presidents:

But before he had been in office a month, he caught a cold that developed into pneumonia. On April 4, 1841, he died--the first President to die in office--and with him died the Whig program.

Today's Question:

What is the source for the quotation "There is only one good, knowledge, and one evil, ignorance?"

I've got no guess or answer for this one.

(Sources: American Mensa, email transmission, May 4th; http://www.whitehouse.gov/about/presidents/williamhenryharrison; http://www.whitehouse.gov/; http://www.britannica.com/EBchecked/topic/641788/Whig-Party)

Compiled by Otto and Patricia Ladensack