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Ah, yes. But look at how scientists go about what they do... much of today's scientific research involves finding things, making discoveries that support whatever theory is most favoured at the time. When a paradigm shift happens, the focus of research shifts and people start looking for answers that reinforce the new 'dominant' theory. At least, that's the postmodern analysis of it. In a way, it's quite true - a lot of research looks at what has previously been assumed, and then tries to find new facts and answers that fit this model.
Yes, and I disagree with that. But there is one absolute - the reality of what is. People can attempt to gloss over that fundamental fact in the mess most people call their mind, but it is there.
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Now imagine an incorporeal concept like "justice"... the process of definition just got a whole lot harder. In the end, language is basically a process of semiotics. Signs and symbols. The reality of an object or concept is never actually defined; all we do is give words and meanings to our interpretations of those objects and concepts.
And again, that's wrong, which is where the problems start. How do you even know what I'm saying? How do I know what you mean by "paradigm shift?" Because the words have an objective standard - until they are given an absolute definition, words are just a meaningless jumble of arbitrary combinations of letters, and letters are just meaningless symbols. But we give them objectivity. "tree" means this, "dog" is that.