“A leftist government doesn't exist because being on the left has nothing to do with governments.”
“Define proof. It's accepted that black holes exist, yet no one has ever seen one. We know they exist because of their effect on nearby objects. Do I have the left arm of ET strapped to a table? No. Are there (government) programs that do, and witnesses willing to come forward and testify to this in the right setting? Yes.”
Undated
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Steven M. Greer 25
American ufologist 1955Related quotes

1950's, On Being a Graphic Artist', 1953
Context: As far as I know, there is no proof whatever of the existence of an objective reality apart from our senses, and I do not see why we should accept the outside world as such solely by virtue of our senses. These reality enthusiasts are possibly playing at hide-and-seek; at any rate they like to hide themselves, though they are not usually aware of it. They simply do it because they happen to have been born with a sense of reality, that is, with a great interest in so-called reality, and because man likes to forget himself.

The Manila Bulletin http://www.mb.com.ph/govt-monitoring-budget-too-much/
2014

1990s, I Am a Man, a Black Man, an American (1998)

After being wounded during the attack on Santa Cruz de Tenerife (24 July 1797), as quoted in The Dispatches and Letters of Vice Admiral Lord Viscount Nelson with Notes (1845) edited Nicholas Harris Nicolas, Vol. II : 1795-1797, p. 423
1790s