Any physical theory is always provisional, in the sense that it is only a hypothesis: you can never prove it. No matter how many times the results of experiments agree with some theory, you can never be sure that the next time the result will not contradict the theory. On the other hand, you can disprove a theory by finding even a single observation that disagrees with the predictions of the theory. As philosopher of science Karl Popper has emphasized, a good theory is characterized by the fact that it makes a number of predictions that could in principle be disproved or falsified by observation. Each time new experiments are observed to agree with the predictions the theory survives, and our confidence in it is increased; but if ever a new observation is found to disagree, we have to abandon or modify the theory.
Stephen HawkingRelated topics
abandon confidence fact found finding good hand hypothesis matter next number observation philosopher physical popper principle prove provisional result science sense single sure theory times timeRelated quotes
You [ Katherine Sophie Dreier; director of the Art Center in New York City; she co-founded with Duchamp and Man Ray the 'Sociéte Anonyme' in Manhattan in 1920] must understand:
My attitude toward the book is based upon my attitude towards 'Art' since 1918 – so I am furious myself that you will accept only partly that attitude [in a new publication by Katherine Dreier]. It can be no more question of my life as an artist's life: [because] I gave it up ten years ago; this period is long enough to prove that my intention to remain outside of any art manifestation is permanent... The third question is that I want to be alone as much as possible.
This abrupt way to speak of my 'hardening process' is not meant to be mean, but is the result of '42 years of age'....10 000 apologies for this rough letter and affectueusement
Dee.
Marcel Duchamp
From a Darwinian point of view, human beliefs are adaptations to our part of the world. No doubt much of what we believe must be roughly accurate, or else we would not have survived. But the beliefs we have evolved might latch on to the world only enough to help us stumble our way through it, and then only for the time being. Human belief-systems could be useful illusions, appearing and disappearing as they prove to be more or less advantageous in the random walk of natural selection. Might not evolution be one of these illusions? Scientific naturalism is the theory that human beliefs are evolutionary adaptations whose survival has nothing to do with their truth. But in that case scientific naturalism is self-defeating, since on its own premises scientific theories cannot be known to be true.
John N. Gray
If Christ were to walk in this world today, do you know what would happen to Him? He would be placed in a mental institution and given psycho-therapy, just as would His Saints. The world would crucify Him today just as it did 2000 years ago, for the world has not learned a thing, except more devious forms of hypocrisy. And what would happen if, in one of my classes at the university, I would one day tell my students that all the learning of this world is of no importance beside the duty of worshipping God, accepting the God-man who died for our sins, and preparing for the life of the world to come? They would probably laugh at me, and the university officials, if they found out, would fire me-for it is against the law to preach the Truth in our universities. We say that we live in a Christian society, but we do not: we live in a society.
Seraphim Rose
P. Bernays has pointed out on several occasions that, since the consistency of a system cannot be proved using means of proof weaker than those of the system itself, it is necessary to go beyond the framework of what is, in Hilbert's sense, finitary mathematics if one wants to prove the consistency of classical mathematics, or even that of classical number theory. Consequently, since finitary mathematics is defined as the mathematics in which evidence rests on what is intuitive, certain abstract notions are required for the proof of the consistency of number theory.... In the absence of a precise notion of what it means to be evident, either in the intuitive or in the abstract realm, we have no strict proof of Bernays' assertion; practically speaking, however, there can be no doubt that it is correct...
Paul Bernays
We analyzed the first stage of our construction, confined to two-dimensional space, and found it to be as durable and resistant as the earth itself. We build in this space just as we would on the ground, and therefore must take as our point of departure the concepts of gravity and force of attraction, as the foundation of everything built on the land. In PROUN the reciprocity of the effects of gravity [Newton, 'for every action an equal and opposite reaction'] manifests itself in a new capacity. We see that on the surface (plane) of the picture, the PROUN ceases to exist as such and becomes a building surveyed from every direction - considered from above or examined from below. The result of this turns out to be the destruction of the single axis that leads to the horizon.
El Lissitsky
