Absolute truth is a statement that is true at all times and in all places. It is something that is always true no matter what the circumstances. It is a fact that cannot be changed. For example, there are no round squares. There are also no square circles. The angles of a triangle add up to 180 degrees. These are all true by definition. Very similar are the propositions of Euclid, because they are proved once the axioms are accepted. One way or another, these are all truths because they are logically true.
According to Martin Luther (the reformer), "I shall never be a heretic; I may err in dispute, but I do not wish to decide anything finally; on the other hand, I am not bound by the opinions of men."  This means that if truth is not absolute it is not truth at all. Interestingly enough, Aristotle states that, “The high-minded man must care more for the truth than for what people think.”  According to him, if we consider ourselves to be wise individuals, our concern should be to find the truth not to submit to opinions.
"In two national surveys conducted by Barna Research, one among adults and one among teenagers, people were asked if they believe that there are moral absolutes that are unchanging or that moral truth is relative to the circumstances. By a 3-to-1 margin (64% vs. 22%) adults said truth is always relative to the person and their situation. The perspective was even more lopsided among teenagers, 83% of whom said moral truth depends on the circumstances, and only 6% of whom said moral truth is absolute."
Absolute truths are different to empirical truths. All the findings of science are empirical: based on evidence, and even if they are true in this world they don't need to be so in all the other possible worlds; they might also be wrong or incomplete due to lack of sufficient evidence. On the other hand, absolute truths might be based on logical truths, wich are true by definition of their axioms.
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