I hold that the mark of a genuine idea is that its possibility can be proved, either a priori by conceiving its cause or reason, or a posteriori when experience teaches us that it is in fact in nature.
Gottfried Leibniz

Perhaps the fact that we have seen millions voting themselves into complete dependence on a tyrant has made our generation understand that to choose one's government is not necessarily to secure freedom.
Friedrich August von Hayek

I regard it in fact as the great advantage of the mathematical technique that it allows us to describe, by means of algebraic equations, the general character of a pattern even where we are ignorant of the numerical values which will determine its particular manifestation.
Friedrich August von Hayek

To act on the belief that we possess the knowledge and the power which enable us to shape the processes of society entirely to our liking, knowledge which in fact we do not possess, is likely to make us do much harm.
Friedrich August von Hayek

We must face the fact that the preservation of individual freedom is incompatible with a full satisfaction of our views of distributive justice.
Friedrich August von Hayek

Man does not live by words alone, despite the fact that sometimes he has to eat them.
Adlai E. Stevenson

The Assembly has witnessed over the last weeks how historical truth is established; once an allegation has been repeated a few times, it is no longer an allegation, it is an established fact, even if no evidence has been brought out in order to support it.
Dag Hammarskjold

No cause is left but the most ancient of all, the one, in fact, that from the beginning of our history has determined the very existence of politics, the cause of freedom versus tyranny.
Hannah Arendt

I sort of enjoy the fact that I'm misunderstood most of the time. That's fine.
Billie Joe Armstrong

Admittedly, a homosexual can be conditioned to react sexually to a woman, or to an old boot for that matter. In fact, both homo - and heterosexual experimental subjects have been conditioned to react sexually to an old boot, and you can save a lot of money that way.
William S. Burroughs

Artists to my mind are the real architects of change, and not the political legislators who implement change after the fact.
William S. Burroughs

No testimony is sufficient to establish a miracle, unless the testimony be of such a kind, that its falsehood would be more miraculous than the fact which it endeavors to establish.
David Hume

The great tragedy of science - the slaying of a beautiful hypothesis by an ugly fact.
Thomas Huxley

Sit down before fact as a little child, be prepared to give up every conceived notion, follow humbly wherever and whatever abysses nature leads, or you will learn nothing.
Thomas Huxley

Science is organized common sense where many a beautiful theory was killed by an ugly fact.
Thomas Huxley

My business is to teach my aspirations to confirm themselves to fact, not to try and make facts harmonize with my aspirations.
Thomas Huxley

In scientific work, those who refuse to go beyond fact rarely get as far as fact.
Thomas Huxley

What strikes me is the fact that in our society, art has become something which is only related to objects, and not to individuals, or to life.
Michel Foucault

I'm interested in what would normally be considered the worst aspects of commercial art. I think it's the tension between what seems to be so rigid and cliched and the fact that art really can't be this way.
Roy Lichtenstein

I'm a big believer in the fact that life is about preparation, preparation, preparation.
Johnnie Cochran