“Always leave them wanting more.”
Commonly attributed to Barnum without citation; such as in "Pardon My French: How a Grumpy American Fell in Love with France" https://books.google.com/books?id=bRYQCwAAQBAJ&pg=PT192&lpg=PT192&dq=who+said+always+keep+them+wanting+more+P.T.+Barnum&source=bl&ots=CVHbQiDHrL&sig=0_Dch_nOKrzDEQLXzu7R9u66ZQs&hl=en&sa=X&ved=0ahUKEwiU-sL-k_naAhWM44MKHWFICwwQ6AEIhAEwDQ by Allen Johnson
Disputed
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P.T. Barnum 17
American showman and businessman 1810–1891Related quotes

“They always want more — they want more.”
"Human Racing"
Marry Me (2007)
Context: Romeo, where'd you go?
It's been years and still no sign,
But I'm keeping hope alive. Juliet, how you been?
You look like death like you sure could use some rest
from this place human racing and the faces of people who pound at your door
They always want more — they want more.
(ru) Они хотят в Крым но там их никто не ждет. Если Хотят уезжать, то пусть катятся к себе в Казань.
Nishonov on where he thinks Crimean Tatars should live https://books.google.com/books?id=_jgHAAAAMAAJ
“I can't help it when people are frightened," says Merricat. "I always want to frighten them more.”
Source: We Have Always Lived in the Castle

Reflections on Various Subjects (1665–1678), I. On Confidence

2010s
Source: Jonah Lehredec. " A Physicist Solves the City http://www.nytimes.com/2010/12/19/magazine/19Urban_West-t.html?pagewanted=5&_r=1," in www.nytimes.com. Dec 17, 2010.

“They can do it. Just leave them alone. That's a lifestyle I don't want to touch.”
1970s, They're Born That Way (1971)

“Disease makes men more physical, it leaves them nothing but body.”
Source: The Magic Mountain (1924), Ch. 4