

“You may think I’m small, but I have a universe inside my mind.”
The quote "You may have the universe if I may have Italy." is famous quote attributed to Giuseppe Verdi (1813–1901), Italian composer.
Avrai tu l'universo, resti l'Italia a me.
This is from Verdi's Attila, Prologue, sc. 1, but the words are by Verdi's librettist Temistocle Solera; translation from Michael A. Musmanno The Story of the Italians in America (New York: Doubleday, 1965) p. 255.
Misattributed
Avrai tu l'universo, resti l'Italia a me.
Misattributed
“You may think I’m small, but I have a universe inside my mind.”
New Scientist
Reviews
Speech to Working Men of Dundee July 14, 1875 - Speeches of Alexander Mackenzie during his recent visit...page 43
Vague Thoughts On Art (1911)
Context: Art is the great and universal refreshment. For Art is never dogmatic; holds no brief for itself; you may take it, or you may leave it. It does not force itself rudely where it is not wanted. It is reverent to all tempers, to all points of view. But it is wilful — the very wind in the comings and goings of its influence, an uncapturable fugitive, visiting our hearts at vagrant, sweet moments; since we often stand even before the greatest works of Art without being able quite to lose ourselves! That restful oblivion comes, we never quite know when — and it is gone! But when it comes, it is a spirit hovering with cool wings, blessing us from least to greatest, according to our powers; a spirit deathless and varied as human life itself.
“Your waistline may be spreading but you can't blame it on the expansion of the universe.”
as quoted by Zeeya Merali in Cosmic expansion is not to blame for expanding waistlines http://www.newscientist.com/article/mg18825194.800-cosmic-expansion-is-not-to-blame-for-expanding-waistlines.html, New Scientist, 1 October 2005.
Quoted in "Stephen Hawking prepares for weightless flight", New Scientist (26 April 2007) http://www.newscientist.com/article/dn11722-stephen-hawking-prepares-for-weightless-flight.html
“There is no fixed, eternal frame to the universe to define what may or may not exist.”
Three Roads to Quantum Gravity (2000)
Source: https://theosophy.world/sites/default/files/ebooks/Annie%20Besant-In-The-Outer-Court.pdf In the Outer Court (1895)