I am not sure what you mean by absolute truth. Do you mean something that everyone believes or that applies to everyone whether they believe it or not? I don't think there is any one thing that EVERYONE believes absolutely. If there is an absolute truth that applies to everyone whether they believe it or not, the only thing I can think of might be 'do no harm'. Not many of us live it, but I think we should avoid doing harm. But I am not sure that is really an absolute truth.
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