I think there is an objective Truth. I am doubtful that humans have access to it, because we have to make due with the observation/logic method. When we state something as "True", it's often a statement of collective or personal belief, backed up by evidence.
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If you believe that truth is always absolute, then is a color blinded person telling the truth when he states the color that he sees of a certain object even if you, as someone who's not color blind, sees a different color pertaining to that object?
Yes. A man could rightly state "I see green", if he defined green to be a photon of light with wavelength of about 530nm. A colour-blind man could say "I see grey", if he defined grey to be a photon of certain properties. Both statements are true. We cannot compare our perceptions, merely state them. This does not imply that the photon isn't actually of an objective, real wavelength. It means we mightn't be able to perceive it. As long as we don't claim it to the the case that the photon IS of wavelength 530nm (which we do have to do pragmatically), we are in the clear philosophically.
There are two definitions of true that I use; an accurate description of the metaphysical state of the Universe being "Truth", and an idea with a huge degree of empirical verification being "truth". I think it is necessary to admit that we make certain assumptions when talking about the universe, that undermine the quality of our evidence.
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The scientist only imposes two things, namely truth and sincerity, imposes them upon himself and upon other scientists - Erwin Schrodinger
Member of the WP Strident Atheists