“You have learnt something. That always feels at first as if you had lost something.”
Act III
Source: 1900s, Major Barbara (1905)
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George Bernard Shaw 413
Irish playwright 1856–1950Related quotes

“I thought that all generations were lost by something and always had been and always would be”
Source: A Moveable Feast
"The One Who Was Different"
The Lost World (1965)

“If you want something you have never had, you must be willing to do something you have never done.”
Not found in Jefferson's writings, according to the Jefferson Monticello center https://www.monticello.org/site/research-and-collections/if-you-want-something-you-have-never-had-quotation. First known appearance in print is from 2004.
Misattributed

“If you have nothing in quantum mechanics, you will always have something.”
"A Universe From Nothing" by Lawrence Krauss, AAI 2009 http://www.youtube.com/watch?v=7ImvlS8PLIo