“Expectations should not always be taken as reality; because you never know when you will be disappointed.”
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Samuel P. Huntington 36
American political scientist 1927–2008Related quotes

“If you expect nothing from somebody you are never disappointed.”
Source: The Bell Jar (1963), Ch. 5

“You should never be surprised when someone treats you with respect, you should expect it.”
Source: Keeping the Moon

Speech to the assembled White House staff before his final departure (9 August 1974)
1970s

"An Interview With The Black Swan — Mila Kunis" https://medium.com/hope-lies-at-24-frames-per-second/an-interview-with-the-black-swan-mila-kunis-c365cb3c33e0 (11 May 2011)

Source: Disappointment with God: Three Questions No One Asks Aloud

“Don't expect much and you won't be disappointed.”
Variant: Don't expect much, and you won't be disappointed.
Source: The Wizard Heir